US2642557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail safe limit switch
Assignee: Unisys Corp
•
Filing: 1949-12-09
•
Granted: 1953-06-16
•
Expires: 1969-12-09
Abstract
No abstract record available.
Inventors
- 👤 Goldstein Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:57
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/0055; G05D1/0066; B; B64; B64C; B64C13/00; B64C13/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1969926A
Cited
US2190682A
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US2377286A
Cited
US2367746A
Cited
US2397557A
Cited
US2441149A
Cited
US2433920A
Cited
US2498280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |