US2656004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multisection acoustic filter
Assignee: RCA Corp
•
Filing: 1947-04-29
•
Granted: 1953-10-20
•
Expires: 1967-04-29
Abstract
No abstract record available.
Inventors
- 👤 Harry F Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:02
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1757459A
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US1572387A
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US1915358A
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US1914072A
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US2097289A
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FR833663A
Cited
US2299112A
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US2325688A
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US2272937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |