Patent US3109128A successfully refreshed from Google Patents.
US3109128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo-mechanism control circuit
Assignee: AT&T Inc
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Filing: 1960-09-19
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Granted: 1963-10-29
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Expires: 1980-09-19
Abstract
No abstract record available.
Inventors
- 👤 David H Pruden
- 👤 Joseph W Timko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:57
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/121; G05D3/14; G05D3/1427
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A SERVO-MECHANISM CONTROL CIRCUIT COMPRISING FIRST AND SECOND MOTOR-GENERATOR UNITS, A DRIVING CIRCUIT FOR SAID MOTORS PRODUCING AN OUTPUT VOLTAGE DETERMINED BY AN ERROR VOLTAGE SUPPLIED THERETO, A FEEDBACK LOOP FOR STABLIZING EACH UNIT, A FIRST SWITCHING MEANS NORMALLY CONNECTING SAID DRIVING CIRCUIT TO ONLY ONE OF SAID MOTORS AND, UPON OPERATION OF SAID MEANS, TO CONNECT SAID DRIVING CIRCUIT TO ONLY THE OTHER MOTOR, OUTPUT SHAFTS FOR SAID UNITS, A SPEED REDUCTION MEANS AND A CLUTCH INTERCONNECTING SAID OUTPUT SHAFTS, A SECOND SWITCHING MEANS NORMALLY CONNECTING EACH GENERATOR TO SAID OTHER MOTOR THROUGH PATHS INCLUDING IMPEDANCE MEANS AND, UPON OPERATION OF SAID SECOND SWITCHING MEANS, TO OPEN SAID PATHS, AND A SPACED RESPONSIVE CONTROL MEANS FOR SIMULTANEOUSLY ENGAGING SAID CLUTCH AND OPERATING BOTH SWITCHING MEANS.
Claim 2
Dependent Claim
126 words
A SERVO-MECHANISM CONTROL CIRCUIT COMPRISING FIRST AND SECOND MOTOR-GENERATOR UNITS, A DRIVING CIRCUIT FOR SAID MOTORS PRODUCING AN OUTPUT VOLTAGE DETERMINED BY AN ERROR VOLTAGE SUPPLIED THERETO, A FEEDBACK LOOP FOR STABLIZING EACH UNIT, A FIRST SWITCHING MEANS NORMALLY CONNECTING SAID DRIVING CIRCUIT TO ONLY ONE OF SAID MOTORS AND, UPON OPERATION OF SAID MEANS, TO CONNECT SAID DRIVING CIRCUIT TO ONLY THE OTHER MOTOR, OUTPUT SHAFTS FOR SAID UNITS, A SPEED REDUCTION MEANS AND A CLUTCH INTERCONNECTING SAID OUTPUT SHAFTS, A SECOND SWITCHING MEANS NORMALLY CONNECTING EACH GENERATOR TO SAID OTHER MOTOR THROUGH PATHS INCLUDING IMPEDANCE MEANS AND, UPON OPERATION OF SAID SECOND SWITCHING MEANS, TO OPEN SAID PATHS, AND A SPACED RESPONSIVE CONTROL MEANS FOR SIMULTANEOUSLY ENGAGING SAID CLUTCH AND OPERATING BOTH SWITCHING MEANS.
References Cited (Backward Citations)
US2511863A
Cited
GB707138A
Cited
US2751535A
Cited
US2798992A
Cited
US2764720A
Cited
US2872112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-28 | 1967-04-29 | 1967-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-28 | 1971-04-29 | 1971-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-28 | 1975-04-29 | 1975-10-29 | $7700.00 | Window Closed / Lapsed |