Patent US3447647A successfully refreshed from Google Patents.
US3447647A
Expired / Lapsed
US
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Hydraulic-pneumatic tread brake unit for railway car trucks
Assignee: Westinghouse Air Brake Co
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Filing: 1967-09-05
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Granted: 1969-06-03
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Expires: 1987-09-05
Abstract
No abstract record available.
Inventors
- 👤 Joseph G Stipanovic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:40
CPC Classifications
B; B61; B61H; B61H1/00; B61H1/003; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/40; B60T13/44; F; F16; F16D; F16D2125/00; F16D2125/02; F16D2125/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1805808A
Cited
US1978862A
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US2081239A
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US2514588A
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US2952128A
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US2926758A
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US2923132A
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US3280945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |