Patent US3690964A successfully refreshed from Google Patents.
US3690964A
Expired / Lapsed
US
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Electroluminescent device
Assignee: AT&T Inc
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Filing: 1969-08-08
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Granted: 1972-09-12
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Expires: 1989-08-08
Abstract
Abstract THE EFFICIENCY OF GALLIUM PHOSPHIDE ELECTROLUMINESCENT DEVICES, EMITTING LIGHT IN THE RED REGION OF THE SPECTRUM, PRODUCED BY THE LIQUID PHASE EPITAXIAL DEPOSITION OF PTYPE MATERIAL ON AN N-TYPE SUBSTRATE DEPENDS IN PART ON THE CONCENTRATION OF ZINC AND OXYGEN IN THE GALLIUM SOLVENT USED IN THE DEPOSITION AND ON THE HEAT TREATMENT AFTER DEPOSITION. IT HAS BEEN FOUND THAT INCLUSION IN THE GALLIUM OF 0.03 MOLE PERCENT ZINC AND 0.35 MOLE PERCENT GA2O3 LEAD TO THE PRODUCTION OF MOUNTED DEVICES OF GREATER THAN 6 PERCENT PHOTON EFFICIENCY WHEN JUNCTION FORMATION IS FOLLOWED BY A SUITABLE HEAT TREATING SCHEDULE.
Inventors
- 👤 Robert H Saul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:10
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/81; H10H20/822; H10H20/824; H10P; H10P14/00; H10P14/20; H10P14/26; H10P14/263; H10P14/265; H10P14/29; H10P14/2901; H10P14/2907; H10P14/2909; H10P14/34; H10P14/3402; H10P14/3414; H10P14/3418; H10P14/3438; H10P14/3441; H10P14/3442; H10P14/3444; H10P14/3446; Y; Y10; Y10S; Y10S148/00; Y10S148/065; Y10S148/119; Y10S252/00; Y10S252/95
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |