Patent US3305712A successfully refreshed from Google Patents.
US3305712A
Expired / Lapsed
US
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Plural motor acceleration and braking system
Assignee: Westinghouse Electric Corp
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Filing: 1963-04-03
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Granted: 1967-02-21
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Expires: 1983-04-03
Abstract
No abstract record available.
Inventors
- 👤 Lester J Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:42
CPC Classifications
B; B60; B60L; B60L15/00; B60L15/02; B60L15/04; B60L15/10; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN A CONTROL SYSTEM FOR AN ELECTRIC TRACTION MOTOR, MEANS FOR CONNECTING THE MOTOR TO A POWER SOURCE TO ACCELERATE THE MOTOR, MEANS FOR ESTABLISHING CONNECTIONS FOR DYNAMIC BRAKING OF THE MOTOR, RESISTANCE MEANS FOR CONTROLLING THE MOTOR CURRENT, CONTROL MEANS FOR PROGRESSIVELY VARYING SAID RESISTANCE MEANS DURING ACCELERATION AND DURING BRAKING, AND MAGNETIC AMPLIFIER MEANS FOR CONTROLLING THE OPERATION OF SAID CONTROL MEANS, SAID MAGNETIC AMPLIFIER MEANS INCLUDING MEANS RESPONSIVE TO THE MOTOR CURRENT FOR EFFECTING INTERRUPTION OF THE OPERATION OF THE CONTROL MEANS WHEN THE MOTOR CURRENT EXCEEDS A PREDETERMINED VALUE, AND SAID MAGNETIC AMPLIFIER MEANS
Claim 2
Dependent Claim
98 words
IN A CONTROL SYSTEM FOR AN ELECTRIC TRACTION MOTOR, MEANS FOR CONNECTING THE MOTOR TO A POWER SOURCE TO ACCELERATE THE MOTOR, MEANS FOR ESTABLISHING CONNECTIONS FOR DYNAMIC BRAKING OF THE MOTOR, RESISTANCE MEANS FOR CONTROLLING THE MOTOR CURRENT, CONTROL MEANS FOR PROGRESSIVELY VARYING SAID RESISTANCE MEANS DURING ACCELERATION AND DURING BRAKING, AND MAGNETIC AMPLIFIER MEANS FOR CONTROLLING THE OPERATION OF SAID CONTROL MEANS, SAID MAGNETIC AMPLIFIER MEANS INCLUDING MEANS RESPONSIVE TO THE MOTOR CURRENT FOR EFFECTING INTERRUPTION OF THE OPERATION OF THE CONTROL MEANS WHEN THE MOTOR CURRENT EXCEEDS A PREDETERMINED VALUE, AND SAID MAGNETIC AMPLIFIER MEANS
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |