Patent US2447676A successfully refreshed from Google Patents.
Patent US2686875A successfully refreshed from Google Patents.
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 20:40
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/02; H03L7/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2104801A
Cited
US2173130A
Cited
US2245685A
Cited
US2287925A
Cited
US2250102A
Cited
US2462857A
Cited
US2404568A
Cited
US2434293A
Cited
US2428265A
Cited
US2475074A
Cited
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 |