Patent US2175270A successfully refreshed from Google Patents.
US2175270A
Expired / Lapsed
US
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Reduction of noise
Assignee: RCA Corp
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Filing: 1937-03-31
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Granted: 1939-10-10
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Expires: 1957-03-31
Abstract
No abstract record available.
Inventors
- 👤 Winfield R Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:42
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B14/00; H04B14/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-10-09 | 1943-04-10 | 1943-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-10-09 | 1947-04-10 | 1947-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-10-09 | 1951-04-10 | 1951-10-10 | $7700.00 | Window Closed / Lapsed |