US3100279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for controlling the operation of synchronous motors
Assignee: Electric Machinery Manufacturing Co
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Filing: 1962-01-08
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Granted: 1963-08-06
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Expires: 1982-01-08
Abstract
No abstract record available.
Inventors
- 👤 Thomas G Rohner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:25
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/024
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
A CONTROL DEVICE FOR SYNCHRONOUS MOTORS HAVING A FIELD-WINDING DISCHARGE CIRCUIT AND A FIELD-WINDING EXCITATION CIRCUIT, SAID CONTROL DEVICE INCLUDING A SEMICONDUCTOR IN SAID EXCITATION CIRCUIT AND NORMALLY INOPERATIVE TO MAINTAIN SAID EXCITATION CIRCUIT OPEN, SAID FIELD-WINDING DISCHARGE CIRCUIT INCLUDING A BRANCH FOR DISCHARGING POSITIVE PULSES OF THE SLIP-FREQUENCY CURRENT AND ANOTHER BRANCH FOR DISCHARGING THE NEGATIVE PULSES OF THE SLIP-FREQUENCY CURRENT, A SECOND SEMICONDUCTOR IN ONE OF SAID BRANCHES CONDUCTING THE POSITIVE PULSES, A THIRD SEMICONDUCTOR IN THE OTHER PATH AND CONDUCTING THE NEGATIVE PULSES AND
References Cited (Backward Citations)
US2425047A
Cited
US3020463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-05 | 1967-02-04 | 1967-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-05 | 1971-02-04 | 1971-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-05 | 1975-02-04 | 1975-08-06 | $7700.00 | Window Closed / Lapsed |