US2694758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocking electromagnetic relay
Assignee: British Tabulating Machine Co Ltd
•
Filing: 1951-03-29
•
Granted: 1954-11-16
•
Expires: 1971-03-29
Abstract
No abstract record available.
Inventors
- 👤 Keen Harold Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:48
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/16; H01H50/18; H01H50/32; H01H50/323; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20207; Y10T74/20238
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US621739A
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US811996A
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US1422625A
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US1550611A
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US1497300A
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US1946717A
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US2068682A
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US2169141A
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GB516696A
Cited
US2421641A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-15 | 1958-05-17 | 1958-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-15 | 1962-05-17 | 1962-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-15 | 1966-05-17 | 1966-11-16 | $7700.00 | Window Closed / Lapsed |