US2491338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective switch device
Assignee: General Electric Co
•
Filing: 1945-08-06
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Granted: 1949-12-13
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Expires: 1965-08-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Sidney R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:54
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/666; H01H33/6664; H01F; H01F27/00; H01F27/40; H01F27/402; H01F27/404; H01F27/406; H01H5/00; H01H5/02; H01H75/00; H01H75/02; H01H75/04; H02; H02H; H02H5/00; H02H5/04; H02H5/06; H02H7/00; H02H7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |