US3553551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital speed control apparatus
Assignee: Westinghouse Electric Corp
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Filing: 1969-05-28
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Granted: 1971-01-05
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Expires: 1989-05-28
Abstract
Abstract THIS DISCLOSURE DESCRIBES A DIGITAL CONTROL APPARATUS FOR MOTOR SPEED REGULATION, WHEREIN PULSES PROPORTIONAL TO THE SPEED OF THE MOTOR TO BE CONTROLLED ARE ALTERNATELY SENT TO A VARIABLE TIME DELAY ELEMENT AND TO AN OUTPUT SWITCHING CIRCUIT, AND AFTER A CONTROLLED TIME DELAY, THE PULSES FROM THE VARIABLE TIME DELAY ELEMENT ARE ALSO SENT TO THE OUTPUT SWITCHING CIRCUIT, DEPENDING UPON WHICH PULSES FIRST REACH THE OUTPUT SWITCHING CIRCUIT, A SIGNAL WILL BE PROVIDED TO EITHER SPEED UP OR SLOW DOWN THE MOTOR, WITH THE DESIRED SPEED OF THE MOTOR BEING DETERMINED BY A COMPUTER WHICH CONTROLS THE VARIABLE TIME DELAY.
Inventors
- 👤 Wayne E Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:12
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/34; H02P7/347
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |