US2440401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry battery for hearing aids
Assignee: Burgess Battery Co
•
Filing: 1945-06-15
•
Granted: 1948-04-27
•
Expires: 1965-06-15
Abstract
No abstract record available.
Inventors
- 👤 Dan W Hirtle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:36
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M6/06; H01M6/08; H01M50/00; H01M50/50; H01M50/543; H01M50/552; H01M50/559; H01M50/547; H01M50/548; H01M50/562
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US825882A
Cited
US1176467A
Cited
US1299813A
Cited
US1299149A
Cited
GB389754A
Cited
US2255516A
Cited
US2396693A
Cited
US2360541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-27 | 1951-10-27 | 1952-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-27 | 1955-10-27 | 1956-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-27 | 1959-10-27 | 1960-04-27 | $7700.00 | Window Closed / Lapsed |