US3584267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gallium phosphide electroluminescent junction device
Assignee: AT&T Inc
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Filing: 1969-04-15
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Granted: 1971-06-08
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Expires: 1989-04-15
Abstract
Abstract High efficiency gallium phosphide electroluminescent PN junction devices capable of emitting visible light at room temperature are prepared by depositing an epitaxial layer of N-type gallium phosphide by conventional techniques upon a solution grown P-type gallium phosphide crystal and annealing the resultant junction at temperatures ranging from 450*-725* C.
Inventors
- 👤 Ralph A Logan
- 👤 Harry G White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:51
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
12 words
A device in accordance with claim 1 capable of emitting red light.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |