Patent US2943277A successfully refreshed from Google Patents.
US2943277A
Expired / Lapsed
US
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Apparatus for producing variable time delay
Assignee: General Radio Co
•
Filing: 1956-06-18
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Granted: 1960-06-28
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Expires: 1976-06-18
Abstract
No abstract record available.
Inventors
- 👤 Frank D Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:59
CPC Classifications
H; H01; H01P; H01P11/00; H01P9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US845609A
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US1580953A
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US1994534A
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US2233748A
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DE733752C
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US2467857A
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US2522731A
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US2515683A
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US2619537A
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US2704829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |