US3706020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capstan motor control system
Assignee: DECISION DATA Inc A CORP OF
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Filing: 1971-03-12
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Granted: 1972-12-12
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Expires: 1991-03-12
Abstract
Abstract A CAPSTAN MOTOR CONTROL SYSTEM FOR USE IN MAGNETIC TAPE TRANSPORTS, WHICH PROVIDES FOR A PRE-SHAPED CURRENT TO BE APPLIED TO THE MOTOR FOR PREDETERMINED TIME INTERVALS DURING STARTING AND STOPPING. UNDER CURRENT CONTROL IN THE STARTING INTERVAL, THE MOTOR ACCELERATES TO APPROXIMATELY 80% OF ITS RUNNING SPEED. A SUBSTANTIALLY CONSTANT VOLTAGE IS THEN APPLIED UNDER WHICH THE MOTOR ASYMPTOTICALLY ACCELERATES TO ITS RUNNING SPEED. THE PRE-SHAPED CURRENT IN THE STOPPING INTERVAL IS OF OPPOSITE POLARITY TO SLOW THE MOTOR SPEED. THE MOTOR IS SUBSEQUENTLY DYNAMICALLY BRAKED TO REST.
Inventors
- 👤 Daniel M Klang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:44
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/48; H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |