Patent US2549629A successfully refreshed from Google Patents.
US2549629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receiver for hearing aids
Assignee: MAICO Co Inc
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Filing: 1950-01-12
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Granted: 1951-04-17
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Expires: 1970-01-12
Abstract
No abstract record available.
Inventors
- 👤 Franklin S Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:54
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/60; H04R25/65; H04R25/652; H04R2225/00; H04R2225/025; H04R2225/57
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) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |