US2855573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical filter
Assignee: RCA Corp
•
Filing: 1953-11-20
•
Granted: 1958-10-07
•
Expires: 1973-11-20
Abstract
No abstract record available.
Inventors
- 👤 Gordon L Fredendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:15
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/77; H04N9/78; H03; H03H; H03H7/00; H03H7/01; H03H7/0123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1956121A
Cited
US1902031A
Cited
US2124599A
Cited
US2263376A
Cited
US2585532A
Cited
US2636937A
Cited
US2729698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |