Patent US2659772A successfully refreshed from Google Patents.
US2659772A
Expired / Lapsed
US
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Telephone adapter for hearing aids
Assignee: Individual
•
Filing: 1948-09-13
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Granted: 1953-11-17
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Expires: 1968-09-13
Abstract
No abstract record available.
Inventors
- 👤 Janvier F O'hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:10
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/247; H04M1/2474; H04M1/2475; H04M1/02; H04M1/21; H04M1/215; H04M1/2155
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |