US2822220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined fluid pressure and vacuum brake apparatus
Assignee: Westinghouse Air Brake Co
•
Filing: 1956-12-28
•
Granted: 1958-02-04
•
Expires: 1976-12-28
Abstract
No abstract record available.
Inventors
- 👤 Harry C May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:42
CPC Classifications
B; B61; B61H; B61H9/00; B61H9/006; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/465
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1471073A
Cited
US1943574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |