Patent US3439293A successfully refreshed from Google Patents.
US3439293A
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Assignee: Sprague Electric Co
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Filing: 1965-08-04
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Granted: 1969-04-15
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Expires: 1985-08-04
Abstract
No abstract record available.
Inventors
- 👤 George A Senf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:39
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/30; H03H7/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2467184A
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US2650350A
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US2823354A
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US2892162A
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US2949585A
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US3085214A
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US3173111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |