US2650267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hearing aid construction
Assignee: MAICO Co Inc
•
Filing: 1949-08-26
•
Granted: 1953-08-25
•
Expires: 1969-08-26
Abstract
No abstract record available.
Inventors
- 👤 Warren R Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:27
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/04; Y; Y10; Y10S; Y10S439/00; Y10S439/909
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1576638A
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US1719288A
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US2268619A
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US2269122A
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US2424422A
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US2477653A
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US2482228A
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US2496683A
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US2495546A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |