Patent US4392232A successfully refreshed from Google Patents.
US3231807A
Expired / Lapsed
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Integral motor-tachometer system
Assignee: Ampex Corp
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Filing: 1962-12-18
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Granted: 1966-01-25
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Expires: 1982-12-18
Abstract
No abstract record available.
Inventors
- 👤 Jack K Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:57
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/36; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/486; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/54; H; H02; H02K; H02K23/00; H02K23/66; H02P; H02P23/00; H02P23/18; H02P23/186; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/933
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A MOTOR SPEED CONTROL SYSTEM COMPRISING: A MOTOR INCLUDING A SHAFT AND A ROTOR IN THE FORM OF A DISC HAVING A SMALL MOMENT OF INERTIA MOUNTED ON SAID SHAFT; A LOAD COUPLED TO SAID SHAFT SO AS TO BE DRIVEN THEREBY; INDICIA MEANS CIRCUMFERENTIALLY DISPOSED ABOUT THE DISC ROTOR AND HAVING VARYING TRANSMISSIVITY PATTERNS THEREON; SENSING MEANS DISPOSED ADJACENT THE INDEXING MEANS FOR SENSING THE TRANSMISSIVITY PATTERNS AND FOR PRODUCING A SIGNAL FREQUENCY PROPORTIONAL TO THE SPEED OF THE ROTOR; REFERENCE SIGNAL GENERATING MEANS PROVIDING A STABLE REFERENCE FREQUENCY; MEANS FOR COMPARING THE PROPORTIONAL SIGNAL FREQUENCY TO THE REFERENCE SIGNAL FREQUENCY; AND MEANS RESPONSIVE TO SAID COMPARING MEANS FOR ADJUSTING THE SPEED OF THE MOTOR.
Claim 2
Dependent Claim
116 words
A MOTOR SPEED CONTROL SYSTEM COMPRISING: A MOTOR INCLUDING A SHAFT AND A ROTOR IN THE FORM OF A DISC HAVING A SMALL MOMENT OF INERTIA MOUNTED ON SAID SHAFT; A LOAD COUPLED TO SAID SHAFT SO AS TO BE DRIVEN THEREBY; INDICIA MEANS CIRCUMFERENTIALLY DISPOSED ABOUT THE DISC ROTOR AND HAVING VARYING TRANSMISSIVITY PATTERNS THEREON; SENSING MEANS DISPOSED ADJACENT THE INDEXING MEANS FOR SENSING THE TRANSMISSIVITY PATTERNS AND FOR PRODUCING A SIGNAL FREQUENCY PROPORTIONAL TO THE SPEED OF THE ROTOR; REFERENCE SIGNAL GENERATING MEANS PROVIDING A STABLE REFERENCE FREQUENCY; MEANS FOR COMPARING THE PROPORTIONAL SIGNAL FREQUENCY TO THE REFERENCE SIGNAL FREQUENCY; AND MEANS RESPONSIVE TO SAID COMPARING MEANS FOR ADJUSTING THE SPEED OF THE MOTOR.
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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |