US3227892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor choppers
Assignee: Rawco Instruments Inc
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Filing: 1962-03-29
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Granted: 1966-01-04
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Expires: 1982-03-29
Abstract
No abstract record available.
Inventors
- 👤 Raymond B Basham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:06
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/601
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
92 words
A TRANSISTOR CHOPPER COMPRISING: A TRANSISTOR HAVING A BASE ELECTRODE, AN EMITTER ELECTRODE, AND A COLLECTOR ELECTRODE; DRIVING MEANS IN CIRCUIT WITH SAID BASE AND COLLECTOR ELECTRODES AND PRODUCING A BIAS SIGNAL RENDERING SAID TRANSISTOR ALTERNATELY CONDUCTIVE AND NON-CONDUCTIVE; NEUTRALIZING MEANS INCLUDING A DIODE, A VOLTAGE DIVIDER RESISTOR, AND A NEUTRALIZING RESISTOR CONNECTED SERIALLY BETWEEN SAID BASE AND COLLECTOR ELECTRODES; AND OUTPUT CIRCUIT FOR SAID CHOPPER; AND MEANS CONNECTING SAID NEUTRALIZING RESISTOR IN SAID OUTPUT CIRCUIT; SAID NEUTRALIZING RESISTOR PRODUCING A VOLTAGE EQUAL AND OPPOSITE TO THE "OFFSET VOLTAGE" OF SAID TRANSISTOR.
References Cited (Backward Citations)
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US3003122A
Cited
US3096492A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |