Patent JPH0552934A successfully refreshed from Google Patents.
US2581737A
Expired / Lapsed
US
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Safety device for motors
Assignee: ERWIN B TRUE
•
Filing: 1950-08-07
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Granted: 1952-01-08
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Expires: 1970-08-07
Abstract
No abstract record available.
Inventors
- 👤 Arthur E West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:17
CPC Classifications
B; B60; B60K; B60K28/00; B60K28/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB352144A
Cited
US1654220A
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US2136504A
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US2249893A
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US1298728A
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US1903876A
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US2099804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |