US2686875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency control system
Assignee: Westinghouse Electric Corp
•
Filing: 1945-07-20
•
Granted: 1954-08-17
•
Expires: 1965-07-20
Abstract
No abstract record available.
Inventors
- 👤 Eugene F Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:41
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/02; H03L7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2104801A
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US2173130A
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US2245685A
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US2287925A
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US2250102A
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US2462857A
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US2404568A
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US2434293A
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US2428265A
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US2475074A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |