US2280305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Volume control for hearing aids
Assignee: OTARION Inc
•
Filing: 1941-05-03
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Granted: 1942-04-21
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Expires: 1961-05-03
Abstract
No abstract record available.
Inventors
- 👤 Walter E Schauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:28
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/04; H01; H01C; H01C10/00; H01C10/30; H01C10/38; H03; H03G; H03G3/00; H03G3/02; H03G3/04; H03G3/06; H04R2225/00; H04R2225/61; H04R25/60; H04R25/603
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) | 1945-04-20 | 1945-10-20 | 1946-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-04-20 | 1949-10-20 | 1950-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-04-20 | 1953-10-20 | 1954-04-21 | $7700.00 | Window Closed / Lapsed |