Patent US2937337A successfully refreshed from Google Patents.
US2937337A
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US
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Selectable frequency reference
Assignee: Westinghouse Electric Corp
•
Filing: 1957-09-13
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Granted: 1960-05-17
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Expires: 1977-09-13
Abstract
No abstract record available.
Inventors
- 👤 Clarence I Jones
- 👤 Robert I Van Nice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:33
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/22; E01C19/23; E01C19/28; E01C19/286; H; H03; H03K; H03K23/00; H03K23/64; H03K23/66
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) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |