Patent US2335888A successfully refreshed from Google Patents.
US2335888A
Expired / Lapsed
US
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Overload protective electromagnetic switch
Assignee: John B. Pierce Laboratory
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Filing: 1942-03-12
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Granted: 1943-12-07
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Expires: 1962-03-12
Abstract
No abstract record available.
Inventors
- 👤 Jr William E Stilwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:18
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/52; H01H37/54; H01H51/00; H01H51/02; H01H51/04; H01H51/12; H01H71/00; H01H71/10; H01H71/66; H01H71/68; H01H77/00; H01H77/02; H01H77/04; H01H2037/5463
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) | 1946-12-06 | 1947-06-07 | 1947-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-12-06 | 1951-06-07 | 1951-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-12-06 | 1955-06-07 | 1955-12-07 | $7700.00 | Window Closed / Lapsed |