US3396245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mode of signal responsive hearing aid apparatus
Assignee: Memorex Telex Corp
•
Filing: 1964-12-09
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Granted: 1968-08-06
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Expires: 1984-12-09
Abstract
No abstract record available.
Inventors
- 👤 Dean W Flygstad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:36
CPC Classifications
G; G02; G02C; G02C11/00; G02C11/06; H; H04; H04M; H04M1/00; H04M1/02; H04M1/21; H04M1/215; H04M1/247; H04M1/2474; H04M1/2475; H04R; H04R25/00; H04R25/43; H04R25/55; H04R25/554; H04R2225/00; H04R2225/61; H04R25/60; H04R25/603
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2530621A
Cited
US2686844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-06 | 1972-02-05 | 1972-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-06 | 1976-02-05 | 1976-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-06 | 1980-02-05 | 1980-08-06 | $7700.00 | Window Closed / Lapsed |