Patent US4550730A successfully refreshed from Google Patents.
US1950490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric switch
Assignee: Engineering & Res Corp
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Filing: 1931-11-06
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Granted: 1934-03-13
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Expires: 1951-11-06
Abstract
No abstract record available.
Inventors
- 👤 Charles D Geer
- 👤 Eugene D Stirlen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:09
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/01; G08G1/02; H; H01; H01B; H01B7/00; H01B7/10; H01H; H01H3/00; H01H3/02; H01H3/14; H01H3/141
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) | 1937-03-12 | 1937-09-11 | 1938-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-03-12 | 1941-09-11 | 1942-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-03-12 | 1945-09-11 | 1946-03-13 | $7700.00 | Window Closed / Lapsed |