Patent US2611035A successfully refreshed from Google Patents.
US2611035A
Expired / Lapsed
US
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Noise-canceling microphone
Assignee: RCA Corp
•
Filing: 1950-01-31
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Granted: 1952-09-16
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Expires: 1970-01-31
Abstract
No abstract record available.
Inventors
- 👤 Robert K Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:20
CPC Classifications
B; B27; B27B; B27B5/00; B27B5/10; H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/40; H04R1/406
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1547740A
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US2043416A
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US2198424A
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US2361656A
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US2305599A
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US2301744A
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US2350010A
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US2396222A
Cited
US2544536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-16 | 1956-03-17 | 1956-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-16 | 1960-03-17 | 1960-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-16 | 1964-03-17 | 1964-09-16 | $7700.00 | Window Closed / Lapsed |