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Patent US2424935A successfully refreshed from Google Patents.
US2424935A
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US
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Hearing aid attachment for spectacles
Assignee: Individual
•
Filing: 1944-12-18
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Granted: 1947-07-29
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Expires: 1964-12-18
Abstract
No abstract record available.
Inventors
- 👤 George P Kimmel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:18
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/60; H04R25/604; G; G02; G02C; G02C11/00; G02C11/06; H04R2460/00; H04R2460/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1503908A
Cited
US1567105A
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US2148024A
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US2249572A
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US2179615A
Cited
US2168781A
Cited
US2337953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-28 | 1951-01-27 | 1951-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-28 | 1955-01-27 | 1955-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-28 | 1959-01-27 | 1959-07-29 | $7700.00 | Window Closed / Lapsed |