US3242408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable speed induction motors
Assignee: Associated Electrical Industries Ltd
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Filing: 1962-07-19
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Granted: 1966-03-22
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Expires: 1982-07-19
Abstract
No abstract record available.
Inventors
- 👤 Hetzel Peter John Grenville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:58
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02P27/06; H02P27/02; H02P27/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
SPEED CONTROL ARRANGEMENT FOR AN INDUCTION MOTOR HAVING A PRIMARY WINDING ENERGIZABLE FROM IN ALTERNATING SUPPLY OF FREQUENCY F AMD A SECONDARY WINDING, SAID ARRANGEMENT COMPRISING A SOURCE OF VARIABLE PLURAL-PHASE VOLTAGE HAVING THE SUPPLY FREQUENCY F, CONNECTIONS BETWEEN SAID SECONDARY WINDING AND EACH OF SEVERAL PHASES OF SAID SOURCE, SAID CONNECTIONS INCLUDING INDIVIDUAL ALTERNATING CURRENT SWITCHING MEANS COMPRISING STATIC ELECTRONIC SWITCHING DEVICES, AND SWITCHING CONTROL MEANS FOR SWITCHING SAID SECONDARY WINDING TO THE SEVERAL PHASES
Claim 2
Dependent Claim
76 words
SPEED CONTROL ARRANGEMENT FOR AN INDUCTION MOTOR HAVING A PRIMARY WINDING ENERGIZABLE FROM IN ALTERNATING SUPPLY OF FREQUENCY F AMD A SECONDARY WINDING, SAID ARRANGEMENT COMPRISING A SOURCE OF VARIABLE PLURAL-PHASE VOLTAGE HAVING THE SUPPLY FREQUENCY F, CONNECTIONS BETWEEN SAID SECONDARY WINDING AND EACH OF SEVERAL PHASES OF SAID SOURCE, SAID CONNECTIONS INCLUDING INDIVIDUAL ALTERNATING CURRENT SWITCHING MEANS COMPRISING STATIC ELECTRONIC SWITCHING DEVICES, AND SWITCHING CONTROL MEANS FOR SWITCHING SAID SECONDARY WINDING TO THE SEVERAL PHASES
References Cited (Backward Citations)
US2236984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |