Patent US2490280A successfully refreshed from Google Patents.
US2490280A
Expired / Lapsed
US
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Electromagnetically operated pretensioned contact spring
Assignee: SPX Technologies Inc
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Filing: 1946-02-09
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Granted: 1949-12-06
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Expires: 1966-02-09
Abstract
No abstract record available.
Inventors
- 👤 Frank X Rees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:21
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/64; H01H50/643
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1269917A
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US1799629A
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US1849403A
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US1958646A
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US2134448A
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US2197607A
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US2258123A
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US2360664A
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US2333971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |