Patent DE245199C successfully refreshed from Google Patents.
Patent US2882348A successfully refreshed from Google Patents.
US2882348A
Expired / Lapsed
US
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Hearing aid
Assignee: TELEX Inc
•
Filing: 1957-07-26
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Granted: 1959-04-14
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Expires: 1977-07-26
Abstract
No abstract record available.
Inventors
- 👤 Roger E Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:59
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/40; H04R25/402; G; G02; G02C; G02C11/00; G02C11/06; H01; H01M; H01M50/00; H01M50/20; H01M50/204; H01M50/207; H01M50/216; H04R25/60; H04R25/602; H04R2225/00; H04R2225/021; H04R2225/0213; H04R25/607; Y; Y02; Y02E; Y02E60/00; Y02E60/10
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) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |