Patent US1931291A successfully refreshed from Google Patents.
US1931291A
Expired / Lapsed
US
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Current-interruption-compensating mechanism for electric clocks and the like
Assignee: E INGRAHAM Co
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Filing: 1931-04-30
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Granted: 1933-10-17
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Expires: 1951-04-30
Abstract
No abstract record available.
Inventors
- 👤 Dudley S Ingraham
- 👤 Arthur B Poole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:21
CPC Classifications
G; G04; G04C; G04C15/00; G04C15/0063; G04C15/0072
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) | 1936-10-16 | 1937-04-17 | 1937-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-10-16 | 1941-04-17 | 1941-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-10-16 | 1945-04-17 | 1945-10-17 | $7700.00 | Window Closed / Lapsed |