US3365640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control means for electrical apparatus
Assignee: Sevcon Engineering Ltd
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Filing: 1964-09-25
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Granted: 1968-01-23
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Expires: 1984-09-25
Abstract
No abstract record available.
Inventors
- 👤 Gurwicz Isaac David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:38
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; B; B60; B60L; B60L50/00; B60L50/50; B60L50/52; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A CONTROL SYSTEM FOR A BATTERY OPERATED ELECTRIC MOTOR COMPRISING: A FIRST CONTROLLED RECTIFIER CONNECTED IN SERIES WITH A CAPACITOR BETWEEN A TERMINAL OF THE MOTOR AND THE BATTERY, A SECOND CONTROLLED RECTIFIER CONNECTED IN PARALLEL WITH SAID FIRST RECTIFIER AND CAPACITOR, AND A THIRD CONTROLLED RECTIFIER CONNECTED IN SERIES WITH AN INDUCTOR ACROSS SAID FIRST RECTIFIER; AN "OFF" PULSE CIRCUIT CONNECTED TO THE FIRING TERMINAL OF SAID FIRST RECTIFIER, AND "ON" PULSE CIRCUIT CONNECTED TO THE FIRING TERMINALS OF SAID SECOND AND THIRD RECTIFIERS.
Claim 2
Dependent Claim
85 words
A CONTROL SYSTEM FOR A BATTERY OPERATED ELECTRIC MOTOR COMPRISING: A FIRST CONTROLLED RECTIFIER CONNECTED IN SERIES WITH A CAPACITOR BETWEEN A TERMINAL OF THE MOTOR AND THE BATTERY, A SECOND CONTROLLED RECTIFIER CONNECTED IN PARALLEL WITH SAID FIRST RECTIFIER AND CAPACITOR, AND A THIRD CONTROLLED RECTIFIER CONNECTED IN SERIES WITH AN INDUCTOR ACROSS SAID FIRST RECTIFIER; AN "OFF" PULSE CIRCUIT CONNECTED TO THE FIRING TERMINAL OF SAID FIRST RECTIFIER, AND "ON" PULSE CIRCUIT CONNECTED TO THE FIRING TERMINALS OF SAID SECOND AND THIRD RECTIFIERS.
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) | 1971-01-22 | 1971-07-24 | 1972-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-22 | 1975-07-24 | 1976-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-22 | 1979-07-24 | 1980-01-23 | $7700.00 | Window Closed / Lapsed |