Patent US2497336A successfully refreshed from Google Patents.
US2497336A
Expired / Lapsed
US
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Casing for unitary hearing aids
Assignee: DICTOGRAPH PRODUCTS CO Inc
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Filing: 1946-10-31
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Granted: 1950-02-14
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Expires: 1966-10-31
Abstract
No abstract record available.
Inventors
- 👤 Don H Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:07
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1343717A
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US1578646A
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US1688976A
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US1630028A
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FR834981A
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US2308550A
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US2306707A
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US2327321A
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US2444302A
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US2406583A
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US2424422A
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US2482288A
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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) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |