Patent US2504422A successfully refreshed from Google Patents.
US2983790A
Expired / Lapsed
US
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Electronic sound absorber
Assignee: RCA Corp
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Filing: 1953-04-30
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Granted: 1961-05-09
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Expires: 1973-04-30
Abstract
No abstract record available.
Inventors
- 👤 Harry F Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:58
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/175; G10K11/178; G10K11/1785; G10K11/17857; G10K11/17861; G10K11/1787; G10K11/17873; G10K2210/00; G10K2210/10; G10K2210/128; G10K2210/30; G10K2210/301; G10K2210/3011; G10K2210/321; G10K2210/3217; G10K2210/3221
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |