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Gray-EV: central claims

Source gap (revised after Step 0 OCR and the deep reads). The four patents (US 3,890,548; GB 2,030,801; US 4,595,975; US 4,661,747) now have full OCR text. US 3,890,548 (all 18 pages) and US 4,595,975 were deep-read; GB 2,030,801 and US 4,661,747 rest on digests (the latter parallels the deep-read 4,595,975, not compared line by line). The drawings of 4,595,975 and GB 2,030,801 were not read. The press items and the Crosby letter were read from page images; their OCR text layers are garbled or wrong. What is still missing: (a) the Crosby test reports ("available at EvGray"), with instruments, waveforms and the method of measuring pulsed input; (b) any data from the Japanese party's visit or the TRW eyewitness test; (c) court and DA records (charges, plea, fine); (d) the publication and date of several clippings (dating is by inference). Every statement of what the 1973-74 tests showed rests on promoter or tabloid reports, and the legal facts on a tabloid, an AP item and a promotional feature. Later steps must say plainly when a conclusion rests on [memory] alone.

  1. Gray's pulsed-capacitor-discharge motor (EMA/EMS, US 3,890,548) drives a rotor by discharging capacitors (the patent's block diagram labels 18 capacitors at 3,500 V each, charged from 12 V batteries) through repelling rotor and stator electromagnets across spark gaps, so that current is drawn only at the instant of each discharge. The patent gives no capacitance, power, speed or test figure.
  2. The motor delivered 10 hp (7,460 W) at 1,100 rpm while consuming only about 26.8 W from four batteries of 5,454 Wh, so "measured overall system efficiency" exceeded 99 percent and it could run 203 hours without recharge (Crosby Research Institute letter, 27 Sep 1973, signed by J. A. Maize, testing for Pan World Enterprises, described in the press as a Japanese conglomerate; promoter-side, no instruments or data). The only on-record sceptical eyewitness, TRW's Donald Cronin, says a test he watched (about mid-1974, a Japanese research firm present with instruments) "ran for about 10 seconds and then everything blew"; no source links that visit to the Crosby tests. The press also gives inconsistent figures (100 hp, 1,000 hp per unit, a 100 MW out for 40 kW in substation, 2,500:1).
  3. The collapsing-field "back EMF" of the coils can be captured and returned to a battery or capacitor so that most of the energy is recycled (US 3,890,548 Claim 1; GB 2,030,801; US 4,595,975; US 4,661,747). The patents frame this as regenerating "a part of the energy consumed", "reduced by the actual energy removed ... by the mechanical load"; none states output above input or gives a measurement. The "99% recycled" figure comes from Hackenberger's press statement about energy returned per magnet pulse.
  4. The motor uses a "cold", partly static form of electricity (and possibly atmospheric static electricity) rather than ordinary battery current, which is why it runs cool and can seem to produce more than it consumes. The patent does not use "cold electricity" but does describe a series delay-coil "harness" wound about the engine case that is "believed to provide a static floating flux field", with no function stated and no claim. The "static blended with a small d.c. draw" and atmospheric-static ideas come from Hackenberger and the TATTLER/promotional articles (the atmospheric tap is the article author's speculation).
  5. The Los Angeles District Attorney's raid (22 July, probably 1974) and prosecution were meant to suppress the invention, rather than being a legitimate investor-fraud case (TATTLER and Gray's attorney's account). The DA side (investigator Ran Novell) says the motor is only a starter motor run by batteries and admits no one in the DA's office tested it; the DA says delay came from difficulty finding complainants. AP reports charges in May 1975 of one conspiracy, eight grand theft and three securities-violation counts; a promotional 1976 feature says the serious charges were dropped and Gray pleaded guilty in late March 1976 to two minor securities misdemeanours and paid a fine (amount not stated). Two DA investigators invested their own money in Gray for a while. No document in the folder shows a link between the DA and any auto company.