US2567407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroacoustic transducer
Assignee: Stromberg Carlson Corp
•
Filing: 1948-04-23
•
Granted: 1951-09-11
•
Expires: 1968-04-23
Abstract
No abstract record available.
Inventors
- 👤 Frank H Slaymaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:04
CPC Classifications
H; H04; H04R; H04R23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1534373A
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US1761745A
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US2447333A
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US2323030A
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US2263308A
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US2427348A
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US2430013A
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US2417830A
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US2438936A
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US2443177A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |