Patent US3211956A successfully refreshed from Google Patents.
US3211956A
Expired / Lapsed
US
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Overvoltage protection for step voltage regulators
Assignee: McGraw Edison Co
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Filing: 1961-09-22
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Granted: 1965-10-12
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Expires: 1981-09-22
Abstract
No abstract record available.
Inventors
- 👤 Herbert W Dornbush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:24
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/40; H01F27/402; H01F27/404; H02; H02H; H02H7/00; H02H7/04; H02H7/055
Claims Analysis
Total Claims: 0
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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) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |