Patent US3220341A successfully refreshed from Google Patents.
Patent US2961611A successfully refreshed from Google Patents.
US2961611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency discriminator
Assignee: Epsco Inc
•
Filing: 1957-01-17
•
Granted: 1960-11-22
•
Expires: 1977-01-17
Abstract
No abstract record available.
Inventors
- 👤 Frink M Young
- 👤 Bernard M Gordon
- 👤 Rigby Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:37
CPC Classifications
H; H03; H03D; H03D3/00; H03D3/02; H03D3/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2668910A
Cited
US2469066A
Cited
US2725470A
Cited
US2762949A
Cited
US2724780A
Cited
US2738463A
Cited
US2776424A
Cited
US2847566A
Cited
US2803818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |