Patent US2931871A successfully refreshed from Google Patents.
US2931871A
Expired / Lapsed
US
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Etched circuit relay
Assignee: Unisys Corp
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Filing: 1957-10-29
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Granted: 1960-04-05
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Expires: 1977-10-29
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Dowds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:50
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/54; H01H1/00; H01H1/12; H01H1/36; H01H1/40; H01H1/403; H01H50/14; H01H51/00; H01H51/02; H01H51/04; H01H51/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US998147A
Cited
US1422625A
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US1550611A
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US2158451A
Cited
US2616994A
Cited
US2649513A
Cited
US2576220A
Cited
US2678985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |