US3475566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery holder and switch for hearing aid unit
Assignee: Sonotone Corp
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Filing: 1966-01-04
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Granted: 1969-10-28
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Expires: 1986-01-04
Abstract
No abstract record available.
Inventors
- 👤 Egon Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:13
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/45; H04R25/456; H01; H01H; H01H19/00; H01H19/54; H01H19/60; H01H19/62; H04R25/60; H04R25/602; H01H2300/00; H01H2300/004; H04R2225/00; H04R2225/61; H04R25/603
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |