US3300255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure brake control apparatus with empty and load change-over
Assignee: Westinghouse Air Brake Co
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Filing: 1965-03-01
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Granted: 1967-01-24
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Expires: 1985-03-01
Abstract
No abstract record available.
Inventors
- 👤 Francis R Racki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:09
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/18; B60T8/1893; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622; Y10T137/8663; Y10T137/87169; Y10T137/87217; Y10T137/87225
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
211 words
A LOAD COMPENSATING BRAKE SYSTEM FOR A RAILWAY CAR COMPRISING: (A) A BRAKE PIPE, (B) BRAKE CYLINDER MEANS FOR EFFECTING A BRAKE APPLICATION, (C) A FIRST SOURCE OF FLUID UNDER PRESSURE, (D) A SECOND SOURCE OF FLUID UNDER PRESSURE, (E) CONDUIT MEANS, (F) BRAKE CONTROL VALVE MEANS RESPONSIVE TO A REDUCTION OF FLUID PRESSURE IN SAID BRAKE PIPE TO EFFECT SUPPLY OF PRESSURIZED FLUID FROM SAID FIRST SOURCE TO SAID CONDUIT MEANS AND RESPONSIVE TO SUBSEQUENT INCREASE OF FLUID PRESSURE IN SAID BRAKE PIPE TO EFFECT RELEASE OF FLUID PRESSURE FROM SAID CONDUIT MEANS, (G) RELAY VALVE MEANS INCLUDING: (I) A CASING, (II) A PAIR OF PASSAGEWAYS, ONE OF WHICH IS CONNECTED TO SAID SECOND SOURCE OF FLUID UNDER PRESSURE AND THE OTHER OF WHICH IS CONNECTED TO SAID BRAKE CYLINDER MEANS, (III) A VALVE MEMBER NORMALLY BIASED TO A SEATED POSITION CONNECTING SAID ONE PASSAGEWAY TO SAID OTHER PASSAGEWAY OF SAID PAIR AND BEING OPERABLE TO AN UNSEATED POSITION CONNECTING SAID ONE PASSAGEWAY TO SAID OTHER PASSAGEWAY, (IV) VALVE-OPERATING PISTON MEANS INCLUDING A PAIR OF AXIALLY-SPACED PISTONS OF DIFFERENT EFFECTIVE PRESSURE AREAS AND HAVING A LOST-MOTION CONNECTION THEREBETWEEN, (V) SAID PISTONS COOPERATING WITH SAID CASING TO DEFINE A PLURALITY OF CHAMBERS INCLUDING A CONTROL MEMBER CHAMBER AND AN OUTER CHAMBER,
Claim 2
Dependent Claim
211 words
A LOAD COMPENSATING BRAKE SYSTEM FOR A RAILWAY CAR COMPRISING: (A) A BRAKE PIPE, (B) BRAKE CYLINDER MEANS FOR EFFECTING A BRAKE APPLICATION, (C) A FIRST SOURCE OF FLUID UNDER PRESSURE, (D) A SECOND SOURCE OF FLUID UNDER PRESSURE, (E) CONDUIT MEANS, (F) BRAKE CONTROL VALVE MEANS RESPONSIVE TO A REDUCTION OF FLUID PRESSURE IN SAID BRAKE PIPE TO EFFECT SUPPLY OF PRESSURIZED FLUID FROM SAID FIRST SOURCE TO SAID CONDUIT MEANS AND RESPONSIVE TO SUBSEQUENT INCREASE OF FLUID PRESSURE IN SAID BRAKE PIPE TO EFFECT RELEASE OF FLUID PRESSURE FROM SAID CONDUIT MEANS, (G) RELAY VALVE MEANS INCLUDING: (I) A CASING, (II) A PAIR OF PASSAGEWAYS, ONE OF WHICH IS CONNECTED TO SAID SECOND SOURCE OF FLUID UNDER PRESSURE AND THE OTHER OF WHICH IS CONNECTED TO SAID BRAKE CYLINDER MEANS, (III) A VALVE MEMBER NORMALLY BIASED TO A SEATED POSITION CONNECTING SAID ONE PASSAGEWAY TO SAID OTHER PASSAGEWAY OF SAID PAIR AND BEING OPERABLE TO AN UNSEATED POSITION CONNECTING SAID ONE PASSAGEWAY TO SAID OTHER PASSAGEWAY, (IV) VALVE-OPERATING PISTON MEANS INCLUDING A PAIR OF AXIALLY-SPACED PISTONS OF DIFFERENT EFFECTIVE PRESSURE AREAS AND HAVING A LOST-MOTION CONNECTION THEREBETWEEN, (V) SAID PISTONS COOPERATING WITH SAID CASING TO DEFINE A PLURALITY OF CHAMBERS INCLUDING A CONTROL MEMBER CHAMBER AND AN OUTER CHAMBER,
References Cited (Backward Citations)
US3136588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |