Patent US2712440A successfully refreshed from Google Patents.
US2712440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time delay devices
Assignee: JA Crabtree and Co Ltd
•
Filing: 1950-08-16
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Granted: 1955-07-05
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Expires: 1970-08-16
Abstract
No abstract record available.
Inventors
- 👤 Crabtree John Ashworth
- 👤 Wintle Thomas Daniel Guy
- 👤 Alter Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:15
CPC Classifications
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Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2306877A
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US1240778A
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US1573229A
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US1831138A
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US1883292A
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US1992555A
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US1995721A
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US2190842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-04 | 1959-01-03 | 1959-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-04 | 1963-01-03 | 1963-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-04 | 1967-01-03 | 1967-07-05 | $7700.00 | Window Closed / Lapsed |