Patent US2143401A successfully refreshed from Google Patents.
US2143401A
Expired / Lapsed
US
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Interchangeable shaft for electrical devices
Assignee: Duracell Inc USA
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Filing: 1937-10-07
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Granted: 1939-01-10
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Expires: 1957-10-07
Abstract
No abstract record available.
Inventors
- 👤 Marion J Arvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:24
CPC Classifications
G; G05; G05G; G05G1/00; G05G1/08; G05G1/10; G05G1/12; H; H01; H01C; H01C10/00; H01C10/14; Y; Y10; Y10T; Y10T403/00; Y10T403/53; Y10T74/00; Y10T74/20; Y10T74/20396; Y10T74/20474
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) | 1942-01-09 | 1942-07-11 | 1943-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-01-09 | 1946-07-11 | 1947-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-01-09 | 1950-07-11 | 1951-01-10 | $7700.00 | Window Closed / Lapsed |