Patent DE3201221A1 successfully refreshed from Google Patents.
US2448526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency discriminating circuits
Assignee: Raytheon Co
•
Filing: 1946-04-10
•
Granted: 1948-09-07
•
Expires: 1966-04-10
Abstract
No abstract record available.
Inventors
- 👤 Thomas A O Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:34
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/04; G; G01; G01R; G01R23/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-07 | 1952-03-08 | 1952-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-07 | 1956-03-08 | 1956-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-07 | 1960-03-08 | 1960-09-07 | $7700.00 | Window Closed / Lapsed |