US3463997A
Expired / Lapsed
US
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Excitation system for a polyphase alternating current generator
Assignee: Robert Bosch GmbH
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Filing: 1966-12-14
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Granted: 1969-08-26
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Expires: 1986-12-14
Abstract
Abstract A system for maintaining a constant voltage across the load of a generator by controlling the percent of time per cycle during which field current flows through a rectifier adapted to stop the field current when the sum of two voltages, one proportional to a positive change of output voltage of one phase and the other proportional to the output voltage of another phase, exceed a constant reference voltage.
Inventors
- 👤 Franz W Dietl
- 👤 Edgar Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:16
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30; H02P9/305; H02J; H02J7/00; H02J7/14; H02J7/16; H02J7/24; H02J7/2437; H02P2101/00; H02P2101/30; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/92
Claims Analysis
Total Claims: 0
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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) | 1972-08-25 | 1973-02-24 | 1973-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-25 | 1977-02-24 | 1977-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-25 | 1981-02-24 | 1981-08-26 | $7700.00 | Window Closed / Lapsed |