US1872674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable device to aid hearing
Assignee: Individual
•
Filing: 1930-12-29
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Granted: 1932-08-23
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Expires: 1950-12-29
Abstract
No abstract record available.
Inventors
- 👤 Carroll Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:27
CPC Classifications
A; A61; A61F; A61F11/00; A61F11/04; A61H; A61H23/00; A61H23/02; A61H23/0254; A61H2201/00; A61H2201/01; A61H2201/0119; A61H2201/0134; A61H2201/0157; A61H2201/0165; A61H2201/16; A61H2201/1602; A61H2201/1604; A61H2205/00; A61H2205/02; A61H2205/027
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) | 1935-08-23 | 1936-02-22 | 1936-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-23 | 1940-02-22 | 1940-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-23 | 1944-02-22 | 1944-08-23 | $7700.00 | Window Closed / Lapsed |