US2424776A
Expired / Lapsed
US
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Shockproof electromagnetic device
Assignee: Ward Leonard Electric Co
•
Filing: 1942-06-09
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Granted: 1947-07-29
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Expires: 1962-06-09
Abstract
No abstract record available.
Inventors
- 👤 George M Stapleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:54
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/16; H01H50/18; H01H50/30; H01H50/20; H01H50/22; H01H2050/225; H01H50/163; H01H50/44; H01H50/46; H01H9/00; H01H9/30; H01H9/34; H01H9/40; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US814501A
Cited
US1474344A
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US1669753A
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US1665282A
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US2139666A
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US2156946A
Cited
US2272533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-28 | 1951-01-27 | 1951-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-28 | 1955-01-27 | 1955-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-28 | 1959-01-27 | 1959-07-29 | $7700.00 | Window Closed / Lapsed |