Patent US2813938A successfully refreshed from Google Patents.
US2813938A
Expired / Lapsed
US
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Protective device for electrical switches
Assignee: Individual
•
Filing: 1954-08-25
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Granted: 1957-11-19
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Expires: 1974-08-25
Abstract
No abstract record available.
Inventors
- 👤 Speizman Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:38
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/20; H01H9/28; H01H9/286
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1650348A
Cited
US2192060A
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US2099585A
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US2172731A
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US2285561A
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US2382738A
Cited
US2571837A
Cited
US2523943A
Cited
US2795663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |