US2531055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake apparatus
Assignee: Westinghouse Air Brake Co
•
Filing: 1947-12-23
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Granted: 1950-11-21
•
Expires: 1967-12-23
Abstract
No abstract record available.
Inventors
- 👤 Walter B Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:59
CPC Classifications
B; B61; B61H; B61H13/00; B61H13/005; B60; B60T; B60T17/00; B60T17/08; B60T17/083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |