Patent US4022324A successfully refreshed from Google Patents.
Patent US3555392A successfully refreshed from Google Patents.
US3555392A
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Servo system utilizing pulse frequency proportional control
Assignee: Pratt and Whitney Co Inc
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Filing: 1969-05-05
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Granted: 1971-01-12
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Expires: 1989-05-05
Abstract
Abstract A NUMERICAL CONTROL SERVO SYSTEM IN WHICH THE POSITION ERROR OR LAG IS CONVERTED TO A PULSE FREQUENCY PROPORTIONAL TO THE LAG AND WHERE PROVISION IS MADE FOR VARYING THE CONVERSION FACTOR AS A FUNCTION OF THE LAG OF A PLURALITY OF AXES OF MOVEMENT.
Inventors
- 👤 Johann F Reuteler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:17
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/21; G05B19/25; G05B19/251; G05B19/253; G05B19/27; G05B19/31; G05B19/311
Claims Analysis
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |