Patent US2972022A successfully refreshed from Google Patents.
US2972022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise suppressor for theater sound reproduction
Assignee: RCA Corp
•
Filing: 1955-01-31
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Granted: 1961-02-14
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Expires: 1975-01-31
Abstract
No abstract record available.
Inventors
- 👤 John F Byrd
- 👤 Cataldo U Falco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:00
CPC Classifications
G; G11; G11B; G11B7/00; H; H04; H04S; H04S3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1642710A
Cited
US2065489A
Cited
US2321651A
Cited
US2396409A
Cited
US2714633A
Cited
US2841654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-14 | 1964-08-15 | 1965-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-14 | 1968-08-15 | 1969-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-14 | 1972-08-15 | 1973-02-14 | $7700.00 | Window Closed / Lapsed |