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US2502018A
Expired / Lapsed
US
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Diffraction type sound absorber covered by a membrane
Assignee: RCA Corp
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Filing: 1944-03-30
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Granted: 1950-03-28
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Expires: 1964-03-30
Abstract
No abstract record available.
Inventors
- 👤 Harry F Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:48
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2028180A
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US2029441A
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US2160638A
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US2390262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |