US2481431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shockproof electromagnetic relay
Assignee: Ward Leonard Electric Co
•
Filing: 1943-08-10
•
Granted: 1949-09-06
•
Expires: 1963-08-10
Abstract
No abstract record available.
Inventors
- 👤 Frank G Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:14
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/16; H01H50/18; H01H50/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US779447A
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US792020A
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US1229232A
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US1919979A
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US1901628A
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US1862158A
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US2001494A
Cited
US1989524A
Cited
US2261632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-05 | 1953-03-07 | 1953-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-05 | 1957-03-07 | 1957-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-05 | 1961-03-07 | 1961-09-06 | $7700.00 | Window Closed / Lapsed |