Patent US3398993A successfully refreshed from Google Patents.
US3398993A
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US
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Load modulated combined dynamic and fluid pressure brake control system for railway cars
Assignee: Westinghouse Air Brake Co
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Filing: 1966-09-14
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Granted: 1968-08-27
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Expires: 1986-09-14
Abstract
No abstract record available.
Inventors
- 👤 Ronald A Sarbach
- 👤 Robert D Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:05
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T8/00; B60T8/17; B60T8/176; B60T8/1766; B60T8/18; B60T8/1893
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) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |