Patent US3140427A successfully refreshed from Google Patents.
US3140427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo valve driver
Assignee: Individual
•
Filing: 1961-04-07
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Granted: 1964-07-07
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Expires: 1981-04-07
Abstract
No abstract record available.
Inventors
- 👤 Robert A Freiberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:32
CPC Classifications
F; F41; F41G; F41G7/00; F41G7/20; F41G7/30; F41G7/301
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
AN ACCELERATION SWITCHING CONTROL CIRCUIT COMPRISING A PAIR OF LOAD WINDINGS, A DIRECT CURRENT POWER SOURCE, A BISTABLE FLIP-FLOP CIRCUIT CONNECTED TO SAID POWER SOURCE AND SAID LOAD WINDINGS FOR SELECTIVELY TRANSFERRING POWER TO EACH OF SAID LOAD WINDINGS, A SOURCE OF SQUARE WAVE EXCITATION VOLTAGE AND MAGNETIC MEANS FOR VARYING THE CONDUCTION TIME OF ONE HALF OF SAID BISTABLE FLIP-FLOP WITH RESPECT TO THE OTHER HALF WHILE MAINTAINING A CONSTANT TOTAL PERIOD OF OPERATION CORRESPONDING TO THE PERIOD OF SAID EXCITATION VOLTAGE.
Claim 2
Dependent Claim
83 words
AN ACCELERATION SWITCHING CONTROL CIRCUIT COMPRISING A PAIR OF LOAD WINDINGS, A DIRECT CURRENT POWER SOURCE, A BISTABLE FLIP-FLOP CIRCUIT CONNECTED TO SAID POWER SOURCE AND SAID LOAD WINDINGS FOR SELECTIVELY TRANSFERRING POWER TO EACH OF SAID LOAD WINDINGS, A SOURCE OF SQUARE WAVE EXCITATION VOLTAGE AND MAGNETIC MEANS FOR VARYING THE CONDUCTION TIME OF ONE HALF OF SAID BISTABLE FLIP-FLOP WITH RESPECT TO THE OTHER HALF WHILE MAINTAINING A CONSTANT TOTAL PERIOD OF OPERATION CORRESPONDING TO THE PERIOD OF SAID EXCITATION VOLTAGE.
References Cited (Backward Citations)
US2809303A
Cited
US2985774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |