US2500541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inertia-type electromechanical sound transducing device
Assignee: Individual
•
Filing: 1945-07-18
•
Granted: 1950-03-14
•
Expires: 1965-07-18
Abstract
No abstract record available.
Inventors
- 👤 Emil H Greibach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:49
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/02; H04R25/00; H04R25/60; H04R25/604; H04R25/606; H04R2460/00; H04R2460/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2169806A
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US1692868A
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US1583416A
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US1517063A
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US1630028A
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US2255250A
Cited
US2202906A
Cited
US2252846A
Cited
US2358099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |