Patent US3218530A successfully refreshed from Google Patents.
US3218530A
Expired / Lapsed
US
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Motor speed control by space transmission of electromagnetic energy
Assignee: Singer Co
•
Filing: 1961-08-31
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Granted: 1965-11-16
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Expires: 1981-08-31
Abstract
No abstract record available.
Inventors
- 👤 James W Momberg
- 👤 Edward W Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:17
CPC Classifications
C; C07; C07D; C07D277/00; C07D277/02; C07D277/20; C07D277/32; C07D277/38; C07D277/44; C07D277/46; D; D05; D05B; D05B69/00; D05B69/14; D05B69/18; H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/295
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2089677A
Cited
US2403956A
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US2786972A
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US3001114A
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US2939064A
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US2981880A
Cited
US2981879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |