US2959645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hearing aid
Assignee: Individual
•
Filing: 1956-05-22
•
Granted: 1960-11-08
•
Expires: 1976-05-22
Abstract
No abstract record available.
Inventors
- 👤 Ladd John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:12
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/65; H04R25/652; H04R2225/00; H04R2225/025; H04R25/45
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2477046A
Cited
US2474988A
Cited
US2495546A
Cited
DE922889C
Cited
GB723981A
Cited
US2773941A
Cited
US2808468A
Cited
US2787670A
Cited
US2794085A
Cited
US2874231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |