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Patent US2453281A successfully refreshed from Google Patents.
US2453281A
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Relay control system
Assignee: International Business Machines Corp
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Filing: 1945-10-03
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Granted: 1948-11-09
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Expires: 1965-10-03
Abstract
No abstract record available.
Inventors
- 👤 Joel H Tedder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:12
CPC Classifications
H; H01; H01H; H01H47/00; H01H47/02; H01H47/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2172677A
Cited
US829511A
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US1821813A
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US1812312A
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US1985577A
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US2032743A
Cited
US2211701A
Cited
US2344178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-09 | 1952-05-10 | 1952-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-09 | 1956-05-10 | 1956-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-09 | 1960-05-10 | 1960-11-09 | $7700.00 | Window Closed / Lapsed |