US3588736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-terminal bulk negative resistance device operable in oscillatory and bistable modes
Assignee: International Business Machines Corp
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Filing: 1969-06-30
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Granted: 1971-06-28
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Expires: 1989-06-30
Abstract
Abstract THE NEGATIVE RESISTANCE CIRCUIT INCLUDES A BODY OF N-TYPE GALLIUM ARSENIDE HAVING AN EXCESS CARRIER CONCENTRATION (NO) AND LENGTH (L) SUCH THAT THE BODY EXHIBITS BULK NEGATIVE DIFFERENTIAL CONDUCTIVITY BUT DOES NOT INHERENTLY PRODUCE TRAVELING HIGH FIELD DOMAINS. A P-TYPE CONTACT IS MADE BETWEEN THE FIRST REGION AND CATHODE TO FORM A SECOND REGION OF HIGH RESISTANCE. THE P CONTACT IS SELECTIVELY BIASED TO CAUSE A HIGH FIELD TO SHIFT BETWEEN THE SECOND REGION AND A THIRD REGION BETWEEN THE FIRST REGION AND ANODE. THE SHIFTING BETWEEN REGIONS IS CONTROLLED BY THE BIAS TO PRODUCE EITHER HIGH FREQUENCY OSCILLATIONS OR BISTABILITY.
Inventors
- 👤 James C Mcgroddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:34
CPC Classifications
H; H03; H03B; H03B9/00; H03B9/12
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |