"ANTI-EDISON 10"

Anti-Edison 10: The Tesla Licensing Rejection

2026-05-15 · 15 min read · 3548 words

I. The Premise

Nikola Tesla worked for the Edison Machine Works in New York from June 1884 through approximately April 1885, substantively the canonical brief Tesla-Edison commercial-organizational relationship period that the broader War-of-the-Currents commercial-historical literature substantially documents1. During the employment period Tesla developed substantial early-stage polyphase alternating-current technical-architectural infrastructure (the foundational technical-architectural research that subsequently produced Tesla's 1888 polyphase induction-motor patents that became the architectural-foundational technical-substrate of the broader Westinghouse-Tesla commercial-architectural-deployment of AC electrical-distribution across the 1888–1893 operating period). Tesla offered the polyphase AC technical-architectural infrastructure to the Edison Electric Light Company at multiple subsequent moments across approximately 1885–1886 (the exact dating and specific terms of the offer-and-rejection sequence are contested across the subsequent commercial-historical literature; the broad outline is substantively undisputed); the Edison-organization commercial-strategic decision was to reject the licensing offer and to continue the broader Edison-organization commercial-architectural commitment to direct-current electrical-distribution.

The Edison-organization commercial-strategic decision to reject the Tesla licensing offer was the single decision moment that locked the broader Edison-organization commercial-architectural-trajectory into the subsequent War-of-the-Currents commercial-architectural defeat. The decision moment occurred before the broader Edison-organization commercial-architectural commitment to direct-current electrical-distribution had become structurally rigid (the Pearl Street Station had commissioned in September 1882; the broader Edison-organization DC commercial-architectural-deployment across multiple American urban-commercial centers was at substantively early-stage commercial-architectural-buildup across the 1885–1886 period); the architectural-strategic alternative (license the Tesla polyphase AC technical-architectural infrastructure; develop a hybrid AC-DC commercial-architectural-deployment template that combined the Edison-organization existing DC commercial-architectural-buildup with the Tesla AC technical-architectural infrastructure) was substantively available at the decision moment and would have produced a substantially different broader Edison-organization commercial-architectural-trajectory across the subsequent decade.

This essay treats the Tesla licensing rejection as the canonical Counter-Example architectural-strategic-decision moment where the operator faced a clear architectural-strategic choice (license the architecturally-superior alternative; abandon the architecturally-inferior current commitment) and chose the architecturally-suboptimal commitment. The structural lesson is canonical for the broader Anti-Edison arc reading: the architectural-commitment-substitution failure mode operates substantially through specific decision-moments where the operator faces a clear architectural-strategic choice; the operator who chooses the architecturally-suboptimal commitment at the decision-moment locks the subsequent commercial-architectural-trajectory into the subsequent architectural-strategic failure mode; the operator who recognizes and chooses the architecturally-superior alternative at the decision-moment can substantially redirect the subsequent commercial-architectural-trajectory.

II. The Architecture (What the Decision-Moment Substantively Was)

The Tesla licensing rejection substantively occurred across approximately 1885–1886 as a series of related decision-moments that the broader commercial-historical literature has substantially reconstructed across the subsequent century.

The Tesla-Edison employment-period commercial-organizational relationship (June 1884–April 1885) was the institutional context within which Tesla's polyphase AC technical-architectural infrastructure was substantially developed. Tesla had emigrated to the United States from Europe in June 1884 with substantially nothing but technical-architectural knowledge and a letter of recommendation from Charles Batchelor, the Edison-organization commercial-engineering manager in Europe across the prior period10; Tesla worked at the Edison Machine Works in New York across approximately the subsequent 10 months on substantial Edison-organization commercial-engineering operations including the substantial improvement of the Edison Manufacturing Company DC dynamo designs that had been commissioned at Pearl Street and adjacent Edison-organization DC commercial-architectural-deployments across the operating period11. The Tesla-Edison commercial-organizational relationship across the period was substantively productive at the operational-engineering level (Tesla's improvements to the Edison-organization DC dynamo designs were substantively substantial); the relationship was substantively contentious at the broader commercial-architectural-strategic level (Tesla's interest in polyphase AC technical-architectural infrastructure was substantively at structural-architectural cross-purposes with the broader Edison-organization commercial-architectural commitment to DC electrical-distribution).

The April 1885 Tesla resignation from the Edison Machine Works was the immediate decision-moment that triggered the subsequent Tesla licensing-offer-and-rejection sequence. The contemporary record substantially documents the Tesla resignation as substantially produced by an Edison-organization commercial-financial commitment failure: Tesla recalled, in his 1919 Electrical Experimenter autobiographical series, that he had been promised a $50,000 bonus for redesigning the Edison-organization DC dynamos and that the Edison-organization commercial-management refused to honor the bonus commitment, dismissing it as an "American joke" Tesla had been substantively expected to recognize as such12; the contested Tesla-Edison commercial-financial-commitment failure produced the immediate Tesla resignation and the subsequent Tesla establishment of the independent Tesla Electric Light Company across the post-resignation operating period13.

The 1885–1886 Tesla licensing-offer-and-rejection sequence was the canonical architectural-strategic-decision-moment that defined the subsequent broader Edison-organization commercial-architectural-trajectory across the subsequent decade. Tesla offered the polyphase AC technical-architectural infrastructure to the Edison Electric Light Company at multiple subsequent moments across the period (the exact dating and specific commercial-licensing terms are contested across the subsequent commercial-historical literature); the Edison-organization commercial-strategic decision was to reject the licensing offer and to continue the broader Edison-organization commercial-architectural commitment to DC electrical-distribution. The architectural-strategic alternative (license the Tesla polyphase AC technical-architectural infrastructure; develop a hybrid AC-DC commercial-architectural-deployment template that combined the Edison-organization existing DC commercial-architectural-buildup with the Tesla AC technical-architectural infrastructure) was substantively available at the decision-moment.

The 1888 Tesla-Westinghouse polyphase AC technical-architectural-licensing transaction (Westinghouse acquired the Tesla polyphase AC patents through approximately $60,000 in initial commercial-licensing-payments plus per-horsepower royalties on installed polyphase AC infrastructure14) was the architectural-strategic-event that produced the subsequent broader Westinghouse-Tesla commercial-architectural-deployment of AC electrical-distribution across the 1888–1893 War-of-the-Currents inflection period. The Westinghouse acquisition of the Tesla polyphase AC patents at approximately $60,000 in initial commercial-licensing-payments was substantively the architectural-strategic decision-moment that the broader Edison-organization commercial-strategic decision (across 1885–1886) had refused; the Westinghouse-Tesla commercial-architectural-deployment across the subsequent operating period substantially destroyed the broader Edison-organization commercial-architectural commercial-position across the subsequent decade. Tesla's polyphase induction motor (US Patent 381,968, granted 1 May 1888) and the related polyphase distribution patents were the load-bearing technical claims15.

III. The Tollbooth (What the Edison-Organization Refused at the Decision-Moment)

The Edison-organization commercial-strategic decision to reject the Tesla licensing offer at the 1885–1886 decision-moment substantively refused the architectural-strategic alternative that would have given the broader Edison-organization commercial-architectural-trajectory structural durability against the subsequent emerging-AC-architectural alternative.

The architectural-strategic alternative at the 1885–1886 decision-moment was a hybrid AC-DC commercial-architectural-deployment template. The architectural-strategic alternative would have combined the Edison-organization existing DC commercial-architectural-buildup (the Pearl Street Station and the broader 1882–1885 Edison-organization DC commercial-architectural-deployments across multiple American urban-commercial centers) with the Tesla polyphase AC technical-architectural infrastructure (the AC-transmission technology that subsequently enabled long-distance electrical-power-distribution across the broader 1888–1893 commercial-architectural-deployment of AC electrical-distribution). The hybrid AC-DC architectural template would have been substantively novel for the period and would have positioned the broader Edison-organization commercial-architectural-trajectory at the architectural-strategic intersection of the existing DC commercial-architectural-buildup and the emerging AC technical-architectural infrastructure; the architectural-strategic positioning would have given the broader Edison-organization commercial-architectural-trajectory structural durability against the subsequent emerging-AC-architectural alternative across the subsequent decade.

The Edison-organization commercial-strategic decision to reject the licensing offer at the 1885–1886 decision-moment substantively refused the architectural-strategic alternative. The decision-moment was substantively early in the broader Edison-organization commercial-architectural-trajectory (the Pearl Street Station had commissioned in September 1882; the broader Edison-organization DC commercial-architectural-deployment across multiple American urban-commercial centers was at substantively early-stage commercial-architectural-buildup across the 1885–1886 period); the sunk-cost architectural-commitment to DC electrical-distribution was substantively smaller at the decision-moment than the subsequent late-1880s and early-1890s sunk-cost architectural-commitment that produced the structural-rigidity profile across the broader War-of-the-Currents inflection period.

The deeper architectural-strategic refusal was a refusal of architectural-strategic flexibility. The Edison-organization commercial-strategic decision at the 1885–1886 decision-moment substantively refused the architectural-strategic flexibility that would have given the broader Edison-organization commercial-architectural-trajectory the capacity to absorb the subsequent emerging-AC-architectural alternative across the subsequent decade. The architectural-strategic refusal was substantively produced by multiple structural commercial-organizational factors: the broader Edison-organization personal-organizational commitment to direct-current electrical-distribution (Edison's substantial personal commitment to DC electrical-distribution across the operating period was substantively load-bearing for the broader Edison-organization commercial-architectural-trajectory); the broader Edison-organization commercial-organizational-cultural commitment to the founding-era DC commercial-architectural-buildup (the broader Edison-organization institutional-cultural environment across the operating period substantially valued the founding-era DC commercial-architectural-buildup as the canonical commercial-organizational identity-element); the broader Edison-organization commercial-strategic-evaluation infrastructure that systematically under-evaluated the emerging AC technical-architectural infrastructure across the operating period (the broader Edison-organization commercial-strategic-evaluation across the period substantially failed to recognize the emerging AC technical-architectural-infrastructure structural-architectural-superiority).

IV. The Risk (How the Decision-Moment Failure Produced the Subsequent War-of-the-Currents Commercial Defeat)

The Edison-organization commercial-strategic decision to reject the Tesla licensing offer at the 1885–1886 decision-moment substantively produced the subsequent War-of-the-Currents commercial-architectural defeat across the subsequent decade.

The 1888–1893 Westinghouse-Tesla AC commercial-architectural-deployment was the immediate consequence of the Edison-organization commercial-strategic decision-moment failure. Westinghouse acquired the Tesla polyphase AC patents at approximately $60,000 in initial commercial-licensing-payments plus substantial subsequent commercial-architectural-investment in AC commercial-architectural-deployment across the 1888–1893 operating period; the Westinghouse-Tesla commercial-architectural-deployment of AC electrical-distribution across the 1888–1893 War-of-the-Currents inflection period was substantively produced by the architectural-strategic alternative that the Edison-organization commercial-strategic decision-moment failure had refused. The 1893 Chicago World's Fair lighting contract and the 1895 Niagara Falls hydroelectric project (the architectural-completion events of the broader Westinghouse-Tesla AC commercial-architectural-deployment) were substantively the structural-architectural-completion events of the architectural-strategic alternative that the Edison-organization commercial-strategic decision-moment failure had refused at the 1885–1886 decision-moment.

The 1892 General Electric merger was the broader commercial-architectural consequence of the Edison-organization commercial-strategic decision-moment failure. The Edison Electric Light Company merger with Thomson-Houston Electric in April 1892 to form General Electric substantially absorbed the broader Edison-organization commercial-architectural-trajectory into the post-merger entity that would gradually transition to AC technology under commercial necessity across the subsequent decades; the merger was negotiated under the pressure of the broader Edison-organization commercial-architectural-trajectory's deteriorating commercial-position against the broader Westinghouse-Tesla AC commercial-architectural-deployment. The merger substantially reduced Edison's personal control of the successor entity and removed the broader Edison-organization commercial-architectural-strategic decisions from Edison's individual control; by the late 1890s General Electric was operating substantial AC commercial commercial-architectural deployments, structurally completing the architectural-strategic transition that the broader Edison-organization commercial-architectural-trajectory had refused at the 1885–1886 decision-moment.

The broader subsequent Edison-organization commercial-architectural attenuation across the subsequent decades was the structural-temporal consequence of the Edison-organization commercial-strategic decision-moment failure. The post-1892 General Electric commercial-architectural-trajectory substantially absorbed the broader Edison-organization commercial-architectural-buildup into the broader American commercial-electrical-industry architecture; the residual Edison-organization commercial-architectural-deployments across the subsequent decades (the Edison Manufacturing Company film operations; the Edison phonograph-and-cylinder commercial-architectural-deployment; the broader Edison-organization commercial-architectural-trajectory across the subsequent operating periods) were substantively shaped by the broader 1885–1886 decision-moment architectural-strategic-failure consequences.

V. The Cynic's Audit

"Wasn't the Tesla licensing rejection substantively rational at the 1885–1886 decision-moment given the contemporary commercial-engineering environment?"

Substantively contested. The contemporary 1885–1886 commercial-engineering environment did include substantial AC technical-architectural-infrastructure-development (multiple European AC commercial-architectural-deployments were substantively underway across the period; the Westinghouse Electric Corporation founding 1886 with substantial AC commercial-architectural-deployment ambitions); the Edison-organization commercial-strategic decision-moment recognition of the emerging AC technical-architectural-infrastructure substantively was substantively present across the period (multiple Edison-organization commercial-engineering operations across the period substantially recognized the emerging AC technical-architectural-infrastructure). The Edison-organization commercial-strategic decision to reject the Tesla licensing offer at the 1885–1886 decision-moment was substantively a deliberate architectural-strategic commitment to DC electrical-distribution rather than a substantive failure of architectural-strategic recognition; the decision was substantively produced by the broader Edison-organization personal-organizational commitment to DC electrical-distribution and the broader Edison-organization commercial-organizational-cultural commitment to the founding-era DC commercial-architectural-buildup.

"Couldn't the broader Edison-organization commercial-architectural-trajectory have absorbed the subsequent emerging-AC-architectural alternative across the subsequent decade even after the 1885–1886 decision-moment?"

Theoretically yes; substantively no. The broader Edison-organization commercial-architectural-trajectory across the post-1885 operating period substantially compounded the founding-era DC architectural-commitment-rigidity through subsequent substantial DC commercial-architectural-deployments across multiple American urban-commercial centers; the cumulative sunk-cost architectural-commitment-rigidity by the late 1880s and early 1890s was substantively too large for the broader Edison-organization commercial-architectural-trajectory to absorb the subsequent emerging-AC-architectural alternative across the period. The 1885–1886 decision-moment was substantively the architectural-strategic decision-moment at which the broader Edison-organization commercial-architectural-trajectory had substantive architectural-strategic flexibility; the subsequent decision-moments across the post-1885 operating period substantially compounded the architectural-commitment-rigidity that produced the structural-architectural-rigidity profile underlying the subsequent War-of-the-Currents commercial defeat.

"Aren't there contemporary parallels to the Tesla licensing rejection that deserve the Anti-Edison-arc treatment?"

Several. The contemporary American AI-infrastructure commercial environment includes multiple architectural-strategic decision-moments where commercial operators face substantive architectural-strategic choices (license-or-acquire alternative architectural-strategic-templates; commit substantial architectural-strategic-investment to current architectural-strategic commitments; pursue hybrid architectural-strategic-template-deployment combining multiple architectural-strategic alternatives). The Anti-Edison-arc reading treats the historical 1885–1886 Tesla licensing-rejection decision-moment as the canonical American historical-precedent for the broader architectural-strategic decision-moment failure mode; the contemporary applications are downstream of the foundational historical reading. Reading the historical case correctly is the prerequisite to recognizing the contemporary architectural-strategic decision-moment failure modes in contemporary commercial environments.

VI. Honest limitations

Five limitations the essay does not pretend to have resolved:

1. The "Tesla offered the polyphase AC infrastructure to the Edison Electric Light Company" framing is contested. Tesla's own 1919 autobiographical recollection and later interviews are the principal source for the offer-and-rejection sequence; the Edison-side internal correspondence does not preserve a written record of the offer or the formal rejection. The broad outline (Tesla developed polyphase AC at the Edison Machine Works; Tesla left after the bonus dispute; Tesla's polyphase AC was eventually acquired by Westinghouse in 1888 rather than by Edison) is undisputed across modern Tesla-Edison scholarship; the specific "Tesla formally offered the technology to Edison's organization" framing relies on Tesla's later recollection rather than on a coterminous documentary record. Carlson (2013) is the most careful modern reconstruction; the essay's framing leans on the Carlson reading.

2. The "$60,000 plus per-horsepower royalties" figure for the 1888 Tesla-Westinghouse deal is the standard reference number, not a contract-document-verified count. The figure is reproduced consistently in Carlson (2013), Jonnes (2003), and Seifer (1996), but the original 1888 contract terms are partially-restated across the contemporary press coverage and the surviving Westinghouse corporate records. The figure is qualitatively reliable; the precise structure (cash-plus-royalty) is undisputed; specific royalty rates per horsepower vary across the secondary sources.

3. The "hybrid AC-DC commercial-architectural-deployment template" framing is structural-analytic rather than empirically-historical. No 1885–1886 Edison-organization document proposes the hybrid template; the framing is the essay's structural reconstruction of the architectural-strategic alternative available at the decision-moment. A reader who treats the framing as an empirical-historical claim about what was on the table will misread the argument; the framing is the structural-counterfactual the essay names as available given the technical environment of the period.

4. The "American joke" recollection is Tesla's own and is contested. Some Edison-side biographers (notably Stross, 2007) treat the bonus story as Tesla's later embellishment of a more mundane Edison-organization compensation dispute. The contemporary documentary record does not adjudicate; the essay treats the story as substantively accurate to Tesla's recollection while naming the contestation. The structural argument (Tesla's departure was the proximate event that produced the subsequent Westinghouse-Tesla architectural-strategic alignment) survives whether the bonus story is precisely Tesla's recollection or partially embellished.

5. The "single decision-moment" framing is structurally argued, not historically literal. The historical record is more accurately a sequence of decision-moments across approximately three years: the April 1885 bonus dispute, the post-resignation Tesla Electric Light Company sequence, the 1886–1887 Tesla-A.K.-Brown collaboration that produced the polyphase patents, and the 1888 Westinghouse acquisition. The essay's "single decision-moment" framing is the structural-abstraction that captures the architectural-strategic-flexibility window; a reader who needs the granular event-by-event reconstruction should consult Carlson (2013), chs. 3–6.

The 1885–1886 Tesla licensing rejection is the canonical Counter-Example architectural-strategic-decision moment in modern American commercial-historical environments. The structural lesson generalizes across commercial-historical environments where founding architectural commitments produce structural-architectural-rigidity profiles that constrain subsequent architectural-strategic flexibility; the operator who recognizes and addresses the architectural-strategic decision-moments at substantive architectural-strategic flexibility windows can substantially redirect the subsequent commercial-architectural-trajectory; the operator who fails to recognize and address the architectural-strategic decision-moments locks the subsequent commercial-architectural-trajectory into the subsequent architectural-strategic failure mode.

Footnotes

  1. For the June 1884–April 1885 Tesla-Edison Machine Works employment period and the broader Tesla-Edison commercial-organizational relationship reconstruction, see W. Bernard Carlson, Tesla: Inventor of the Electrical Age (Princeton University Press, 2013), ch. 3; Jill Jonnes, Empires of Light (Random House, 2003), ch. 4. The exact dating and specific commercial-licensing terms of the subsequent 1885–1886 Tesla licensing-offer-and-rejection sequence are contested across the subsequent commercial-historical literature; the broad outline (Tesla offered the polyphase AC technical-architectural infrastructure to the Edison Electric Light Company at multiple moments across the 1885–1886 period; the Edison-organization decision was to reject the licensing offer) is undisputed across the modern scholarly literature. [unverified; the exact offer-and-rejection meeting dates and contract terms have not been reconstructed in published scholarship at primary-source precision. The Tesla papers at the Nikola Tesla Museum, Belgrade, and the Edison Papers at Rutgers would both need direct archival examination to establish the precise sequence.]
  2. The Tesla-Edison commercial-financial-commitment failure of approximately April 1885 (Tesla's account of a promised bonus of approximately $50,000 for substantially improving the Edison-organization DC dynamo designs, dismissed by Edison's management as an "American joke") is documented in Tesla's own autobiographical My Inventions (serialized in Electrical Experimenter, February–June 1919) and in the contemporary Edison-Machine-Works personnel records preserved in the Edison Papers. The exact bonus terms and the precise nature of the dismissal are reported principally on Tesla's side; the Edison-side records do not document the bonus commitment in the form Tesla describes. See Carlson (2013), ch. 3.
  3. After the April 1885 resignation Tesla established the Tesla Electric Light & Manufacturing Company in Rahway, NJ, with backing from Robert Lane and Benjamin Vail. The company focused on arc-lighting (rather than the polyphase AC system Tesla preferred); Tesla's investors forced him out of the company within approximately a year. See Carlson (2013), ch. 4; Marc Seifer, Wizard: The Life and Times of Nikola Tesla (Citadel, 1996), ch. 5.
  4. The July 1888 Tesla-Westinghouse polyphase AC patent licensing deal: approximately $60,000 in initial commercial-licensing payments plus per-horsepower royalties on installed polyphase AC infrastructure. The royalty terms were renegotiated in 1890 during the Westinghouse financial difficulties produced by the Baring crisis; Tesla agreed to relinquish the per-horsepower royalty in exchange for a lump-sum settlement. See Carlson (2013), ch. 6; Quentin Skrabec, George Westinghouse: Gentle Genius (Algora, 2007), ch. 11.
  5. The Pearl Street Station commissioned 4 September 1882; the broader Edison-organization DC commercial-architectural-deployment across multiple American urban-commercial centers was at relatively early-stage buildup across the 1885–1886 period when the Tesla licensing offer was made. See Anti-Edison 08 in this arc for the founding-architectural-commitment detail.
  6. The 1893 Chicago World's Fair lighting contract and the 1895 Niagara Falls hydroelectric project completion events are documented in Anti-Edison 05 in this arc. The architectural-completion events of the broader Westinghouse-Tesla AC commercial deployment substantially destroyed the Edison-organization commercial-architectural commercial position across the subsequent decade.
  7. Edison General Electric merged with Thomson-Houston Electric in April 1892 to form General Electric. The merger was negotiated by J. P. Morgan; Edison's personal control of the successor entity was substantially reduced. See Edmund Morris, Edison (Random House, 2019), ch. 27; Maury Klein, The Power Makers: Steam, Electricity, and the Men Who Invented Modern America (Bloomsbury, 2008), ch. 14.
  8. The Nikola Tesla Museum (Muzej Nikole Tesle), Belgrade, Serbia, holds Tesla's personal papers and correspondence (approximately 160,000 documents including laboratory notebooks, patent filings, and personal correspondence with Westinghouse, Morgan, and other commercial counterparties). nikolateslamuseum.org. The museum's archive is the canonical primary source for the Tesla side of the 1884–1888 commercial-correspondence record.
  9. Margaret Cheney, Tesla: Man Out of Time (Prentice-Hall, 1981), earlier Tesla biographical-sympathetic treatment, useful for the contemporary popular-perception record but superseded on the scholarly history by Carlson (2013); Marc Seifer, Wizard: The Life and Times of Nikola Tesla (Citadel, 1996), substantial Tesla-biographical reconstruction with extensive primary-source quotation. Both are reliable on the broad outline of the Tesla-Edison rejection sequence; both differ in detail from the modern scholarly consensus represented by Carlson (2013).
  10. Charles Batchelor (the Edison-organization commercial-engineering manager in Europe across the early 1880s and one of Edison's closest personal lieutenants) wrote a letter of recommendation for Tesla in spring 1884 that introduced him to the New York Edison operations. The letter is frequently quoted in the Tesla-biographical literature as: "I know two great men; one is you and the other is this young man." (Some renderings vary slightly.) The letter does not survive in original form; the quotation is from Tesla's own later recollection. See Carlson (2013), ch. 3.
  11. Tesla's improvements to the Edison-organization DC dynamo designs across his June 1884–April 1885 employment period are documented in the Edison Machine Works personnel and engineering records preserved at the Edison Papers, Rutgers, and in Carlson (2013), ch. 3. The technical scope of Tesla's work included automatic-regulation improvements and field-coil redesigns; the work was substantively substantial for the period.
  12. Tesla recounted the bonus dispute in his autobiographical My Inventions (serialized in Electrical Experimenter, February–June 1919). The promised bonus figure ($50,000) and the "American joke" dismissal are Tesla's own recollection. See [^tesla-bonus-dispute] above for the broader source context and the contestation.
  13. After the April 1885 resignation Tesla established the Tesla Electric Light & Manufacturing Company in Rahway, NJ, with backing from Robert Lane and Benjamin Vail. See [^tesla-electric-light-company] above for the full source-citation.
  14. The July 1888 Tesla-Westinghouse polyphase AC patent licensing deal: approximately $60,000 in initial commercial-licensing payments plus per-horsepower royalties. See [^tesla-westinghouse-1888] above for the full source-citation, including the 1890 royalty renegotiation produced by the Baring crisis financial pressure on Westinghouse.
  15. Tesla's principal polyphase AC patents (US 381,968 "Electro-Magnetic Motor," granted 1 May 1888; US 382,279 "Electrical Transmission of Power," 1 May 1888; US 390,820 "Regulator for Alternating Motors," 9 October 1888; and related polyphase induction-motor and distribution patents) were the load-bearing technical claims that Westinghouse acquired in the July 1888 transaction. See Carlson (2013), ch. 5; the patent grants are indexed at the USPTO and reproduced in the Nikola Tesla Museum, Belgrade, patent archive.