US2308930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hearing aid apparatus
Assignee: Individual
•
Filing: 1939-02-02
•
Granted: 1943-01-19
•
Expires: 1959-02-02
Abstract
No abstract record available.
Inventors
- 👤 William D Penn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:51
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/02; H04R19/00; H04R19/01; H04R19/016; H04R25/00; H04R25/50; H04R25/502; H04R3/00; H04R3/04; H04R2460/00; H04R2460/13; H04R2499/00; H04R2499/10; H04R2499/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-01-18 | 1946-07-20 | 1947-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-01-18 | 1950-07-20 | 1951-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-01-18 | 1954-07-20 | 1955-01-19 | $7700.00 | Window Closed / Lapsed |