US2981096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustical impedance meter
Assignee: RCA Corp
•
Filing: 1956-12-14
•
Granted: 1961-04-25
•
Expires: 1976-12-14
Abstract
No abstract record available.
Inventors
- 👤 Ross M Carrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:30
CPC Classifications
H; H04; H04R; H04R29/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1743414A
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US1795647A
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US1816917A
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US1935445A
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US2060009A
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US2043984A
Cited
US2576423A
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US2666326A
Cited
DE840453C
Cited
US2837914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |