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US2673898A
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Wearable hearing aid having external microphone with penetrating pin connector structure
Assignee: Sonotone Corp
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Filing: 1951-06-01
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Granted: 1954-03-30
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Expires: 1971-06-01
Abstract
No abstract record available.
Inventors
- 👤 Reichert Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:29
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/08; H04R1/083; H04R25/00; H04R25/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1318874A
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US1689692A
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US1709747A
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US1666729A
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US1826797A
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US2182865A
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US2321370A
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US2582287A
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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) | 1957-03-29 | 1957-09-28 | 1958-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-29 | 1961-09-28 | 1962-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-29 | 1965-09-28 | 1966-03-30 | $7700.00 | Window Closed / Lapsed |