Patent US3412220A successfully refreshed from Google Patents.
US3412220A
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Voltage sensitive switch and method of making
Assignee: Sprague Electric Co
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Filing: 1963-11-26
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Granted: 1968-11-19
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Expires: 1983-11-26
Abstract
No abstract record available.
Inventors
- 👤 Henry F Puppolo
- 👤 Iii Albert E Scherr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:56
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/044; H01; H01C; H01C1/00; H01C1/14; H01C1/142; H01C7/00; H01C7/10; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1735286A
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US2647079A
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US2930951A
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US3025441A
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US3218528A
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US3236936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |