US3558889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bulk semiconductor light radiating device
Assignee: RCA Corp
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Filing: 1966-11-02
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Granted: 1971-01-26
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Expires: 1986-11-02
Abstract
Abstract A light-radiating element, capable of emitting light pulses over a narrow frequency bandwidth, having a duration in the order of 10-9 to 10-7 seconds, is obtained from a given bulk semiconductor material of a single type conductivity, such as N-type GaAs, having ohmic electrodes in response to the application thereto through these ohmic electrodes of an electric field of a magnitude exceeding a given threshold. The pattern of radiation is almost constant over 180* in both horizontal and vertical directions.
Inventors
- 👤 Kern K N Chang
- 👤 Shing-Gong Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:20
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/81
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
19 words
The combination defined in claim 1, wherein said given threshold is in the range between 1200 to 2700 volts/cm.
Claim 2
Dependent Claim
25 words
The combination defined in claim 1, wherein said narrow frequency bandwidth is centered at about 9,000 A and has a bandwidth of about 150 A.
Claim 3
Dependent Claim
27 words
The combination defined in claim 1, wherein said means for applying said field is a pulse generator for applying at least one DC pulse to said element.
Claim 4
Dependent Claim
21 words
The combination defined in claim 4, wherein the duration of said pulse is in the order of 10-9 to 10-7 seconds.
References Cited (Backward Citations)
US3111587A
Cited
US3267317A
Cited
US3312910A
Cited
US3283207A
Cited
US3353114A
Cited
US3412344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |