US3592704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent device
Assignee: AT&T Inc
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Filing: 1968-06-28
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Granted: 1971-07-13
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Expires: 1988-06-28
Abstract
Abstract ELECTROLUMINESCENT P-N DIODES WHICH CONTAIN SULPHUR TO PRODUCE AN EXCESS DONOR CONCENTRATION OF 5 X 1016 TO 2X10**17 CM.-3 EXHIBIT EFFICIENCIES OF AT LEAST AN ORDER OF MAGNITUDE GREATER THAN FOR OTHER N-TYPE DOPANTS. WHEN THE DIODES ARE PRODUCED IN AN AMMONIA ATMOSPHERE, EFFICIENCY IS INCREASED STILL FURTHER.
Inventors
- 👤 Ralph A Logan
- 👤 Harry G White
- 👤 William Wiegmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:37
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/81; H10H20/822; H10H20/824; H10H20/8242; H10P; H10P95/00; H10P14/00; H10P14/20; H10P14/29; H10P14/2901; H10P14/2907; H10P14/2909; H10P14/34; H10P14/3402; H10P14/3414; H10P14/3418; H10P14/3438; H10P14/3441; H10P14/3444; Y; Y10; Y10S; Y10S148/00; Y10S148/049; Y10S148/107; Y10S148/119
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |