Patent US2887304A successfully refreshed from Google Patents.
Patent US3559008A successfully refreshed from Google Patents.
US3559008A
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US
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Voltage proportional speed control of the output of a differential gear connected to two motors utilizing a pulse width modulator control
Assignee: Siemens AG
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Filing: 1968-06-07
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Granted: 1971-01-26
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Expires: 1988-06-07
Abstract
Abstract A PAIR OF DC MOTORS ARE COUPLED TO A SHAFT VIA A DIFFERENTIAL DRIVE. ONE OF THE MOTORS IS ENERGIZED VIA A FIRST MOTOR ENERGIZING CIRCUIT WHICH INCLUDES A FIRST SWITCH. THE OTHER OF THE MOTORS IS ENERGIZED VIA A SECOND MOTOR ENERGIZING CIRCUIT WHICH INCLUDES A SECOND SWITCH. CONTROL CIRCUITRY CONNECTED TO THE FIRST AND SECOND SWITCHES CONTROLS THEIR CONDITION IN ACCORDANCE WITH A CONTROL VOLTAGE PROVIDED BY THE CONTROL CIRCUITRY.
Inventors
- 👤 Hans Stut
- 👤 Reimer Emeis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:55
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/68; H02P5/69; H02P5/695; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/91; Y10S388/915
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |