Patent US2650125A successfully refreshed from Google Patents.
Patent US2903693A successfully refreshed from Google Patents.
US2903693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulation filter
Assignee: Individual
•
Filing: 1954-01-13
•
Granted: 1959-09-08
•
Expires: 1974-01-13
Abstract
No abstract record available.
Inventors
- 👤 Gordon S Ley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:52
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/03; G01S7/038
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2510906A
Cited
US2525328A
Cited
US2518864A
Cited
US2475176A
Cited
US2537596A
Cited
US2537597A
Cited
US2692330A
Cited
US2576157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |