US3136588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure brake control apparatus with empty and load changeover
Assignee: Westinghouse Air Brake Co
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Filing: 1962-12-10
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Granted: 1964-06-09
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Expires: 1982-12-10
Abstract
No abstract record available.
Inventors
- 👤 Glenn T Mcclure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:00
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/18; B60T8/1893
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
156 words
IN A VEHICLE BRAKE APPARATUS, IN COMBINATION: (A) A BRAKE PIPE CHARGED WITH FLUID AT A CERTAIN NORMAL PRESSURE TO EFFECT A BRAKE RELEASE, REDUCTION OF SAID NORMAL PRESSURE BEING EFFECTIVE TO INITIATE A BRAKE APPLICATION ON THE VEHICLE, (B) A DOUBLE-ACTING DIFFERENTIAL AREA FLUID PRESSURE OPERATED CHANGE-OVER VALVE DEVICE SELECTIVELY OPERATIVE FROM A NEUTRAL ZONE TO EITHER OF TWO DIFFERENT POSITIONS ON OPPOSITE SIDES OF ITS NEUTRAL ZONE TO VARY THE DEGREE OF A BRAKE APPLICATION EFFECTED RESPONSIVELY TO A GIVEN REDUCTION OF THE PRESSURE IN THE BRAKE PIPE FROM ITS NORMAL PRESSURE, AND (C) MEANS FOR SELECTIVELY SUBJECTING SAID DIFFERENTIAL AREA VALVE DEVICE TO PRESSURE OF FLUID IN THE BRAKE PIPE ACTING IN ONE DIRECTION ONLY OR SIMULTANEOUSLY IN OPPOSITE DIRECTIONS DEPENDING UPON THE LOAD ON THE VEHICLE, THEREBY TO CAUSE SAID VALVE DEVICE TO BE SHIFTED TO ONE OR THE OTHER OF THE SAID TWO POSITIONS ON OPPOSITE SIDES OF ITS NEUTRAL ZONE.
References Cited (Backward Citations)
US2077923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |