US3222582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable speed motor system utilizing controlled rectifiers
Assignee: Sevcon Engineering Ltd
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Filing: 1961-08-09
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Granted: 1965-12-07
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Expires: 1981-08-09
Abstract
No abstract record available.
Inventors
- 👤 Horace W Heyman
- 👤 Hambleton James
- 👤 Gurwitcz David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:49
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
109 words
A CONTROL SYSTEM FOR A BATTERY-SUPPLIED ELECTRIC MOTOR COMPRISING A TRANSISTOR PULSE GENERATOR HAVING A MANUALLY VARIABLE RESISTANCE CONTROLLING THE PULSE GENERATION FREQUENCY, A DELAY CIRCUIT WITH TRANSISTORS, A MAIN CIRCUIT INCLUDING A BATTERY, A VARIABLE SPEED MOTOR, A DIODE CONNECTED IN PARALLEL THEREWITH, A DIODE IN SERIES THEREWITH, AND A FIRST CONTROLLED RECTIFIER; A PARALLEL PATH ACROSS SAID CONTROLLED RECTIFIER COMPRISING A CAPACITOR AND AN INDUCTOR, AND A SECOND CONTROLLED RECTIFIER CONNECTED ACROSS THE INDUCTOR, AN INTER-CONNECTION BETWEEN SAID PULSE GENERATOR AND FIRST CONTROLLED RECTIFIER TO CONTROL THE PULSE FREQUENCY THEREOF, AND AN INTER-CONNECTION BETWEEN SAID DELAY CIRCUIT, AND SAID SECOND CONTROLLED RECTIFIER TO DETERMINE THE PULSE LENGTH.
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |