US2643370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric circuit checking equipment
Assignee: Westinghouse Air Brake Co
•
Filing: 1951-03-26
•
Granted: 1953-06-23
•
Expires: 1971-03-26
Abstract
No abstract record available.
Inventors
- 👤 William J Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:38
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/005; G01R31/008; B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/228
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1349961A
Cited
US1291861A
Cited
US2052057A
Cited
US2116462A
Cited
US2409840A
Cited
US2556363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |