US2736882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit integrity checking system
Assignee: Westinghouse Air Brake Co
•
Filing: 1952-07-18
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Granted: 1956-02-28
•
Expires: 1972-07-18
Abstract
No abstract record available.
Inventors
- 👤 Andrew J Sorensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:31
CPC Classifications
B; B60; B60L; B60L3/00; B60L1/00; B60L1/02; B60L3/12; B60L50/00; B60L50/50; B60L50/60; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1995272A
Cited
US2072079A
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US2082143A
Cited
US2276706A
Cited
US2479548A
Cited
US2605334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |