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Patent US2211554A successfully refreshed from Google Patents.
US2211554A
Expired / Lapsed
US
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Speed responsive device
Assignee: Hitachi Rail STS USA Inc
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Filing: 1938-04-30
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Granted: 1940-08-13
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Expires: 1958-04-30
Abstract
No abstract record available.
Inventors
- 👤 Herbert L Bone
- 👤 John W Livingston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:32
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/321; B60T8/3235; B60T8/324; H; H01; H01H; H01H35/00; H01H35/06; H01H35/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-08-13 | 1944-02-12 | 1944-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-08-13 | 1948-02-12 | 1948-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-08-13 | 1952-02-12 | 1952-08-13 | $7700.00 | Window Closed / Lapsed |