US2739660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hearing aid attachment
Assignee: Individual
•
Filing: 1951-06-15
•
Granted: 1956-03-27
•
Expires: 1971-06-15
Abstract
No abstract record available.
Inventors
- 👤 George W French
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:50
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/65; H04R25/652; H04R25/656; H04R25/60; H04R25/607; H04R2225/00; H04R2225/021; H04R2225/0213; H04R2225/57; H04R25/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US999225A
Cited
US1302887A
Cited
US1786459A
Cited
US2142407A
Cited
US2545731A
Cited
US2506490A
Cited
US2573132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |