Patent US3408600A successfully refreshed from Google Patents.
US3408600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuned amplifier employing unijunction transistor biased in negative resistance region
Assignee: Westinghouse Electric Corp
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Filing: 1961-03-10
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Granted: 1968-10-29
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Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
- 👤 Angel G Jordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:12
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16; H04B3/18; H03; H03H; H03H11/00; H03H11/46; H03H11/48; H03H11/52; H04B1/00; H04B1/06; H04B1/16; H04B1/163; H10; H10D; H10D99/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A REGENERATIVE TUNED AMPLIFIER COMPRISING A SEMICONDUCTOR UNIJUNCTION TRANSISTOR, MEANS TO BIAS SAID UNIJUNCTION TRANSISTOR OF AN OPERATING POINT IN THE NEGATIVE RESISTANCE REGION OF ITS CURRENT-VOLTAGE CHARACTERISTIC AND MEANS ELECTRICALLY COUPLED IN SERIES WITH SAID UNIJUNCTION TRANSISTOR HAVING A POSITIVE RESISTANCE OF A MAGNITUDE SLIGHTLY LESS THAN THE NEGATIVE RESISTANCE OF SAID UNIJUNCTION TRANSISTOR OF SAID OPERATING POINT, CAPACITIVE MEANS AND LOAD MEANS EACH CONNECTED IN PARALLEL WITH THE NEGATIVE RESISTANCE REGION OF SAID UNIJUNCTION TRANSISTOR.
Claim 2
Dependent Claim
77 words
A REGENERATIVE TUNED AMPLIFIER COMPRISING A SEMICONDUCTOR UNIJUNCTION TRANSISTOR, MEANS TO BIAS SAID UNIJUNCTION TRANSISTOR OF AN OPERATING POINT IN THE NEGATIVE RESISTANCE REGION OF ITS CURRENT-VOLTAGE CHARACTERISTIC AND MEANS ELECTRICALLY COUPLED IN SERIES WITH SAID UNIJUNCTION TRANSISTOR HAVING A POSITIVE RESISTANCE OF A MAGNITUDE SLIGHTLY LESS THAN THE NEGATIVE RESISTANCE OF SAID UNIJUNCTION TRANSISTOR OF SAID OPERATING POINT, CAPACITIVE MEANS AND LOAD MEANS EACH CONNECTED IN PARALLEL WITH THE NEGATIVE RESISTANCE REGION OF SAID UNIJUNCTION TRANSISTOR.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |