US2970244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable resistor
Assignee: Sprague Electric Co
•
Filing: 1956-01-11
•
Granted: 1961-01-31
•
Expires: 1976-01-11
Abstract
No abstract record available.
Inventors
- 👤 Merritt L Beverly
- 👤 Kahn Manfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:58
CPC Classifications
H; H01; H01C; H01C10/00; H01C10/30; H01C10/32; H01C10/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2178283A
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US2358991A
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US2616994A
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US2650270A
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US2676226A
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US2703377A
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US2682018A
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US2740025A
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US2683767A
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US2883499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |