US3175869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure brake control apparatus with accelerated release after service application
Assignee: Westinghouse Air Brake Co
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Filing: 1961-07-21
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Granted: 1965-03-30
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Expires: 1981-07-21
Abstract
No abstract record available.
Inventors
- 👤 Walter B Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:14
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/18; B60T15/24; B60T15/30; B60T15/302
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN A FLUID PRESSURE BRAKER SYSTEM OF THE TYPE INCLUDING A NORMALLY CHARGED BRAKE PIPE, AUXILLIARY RESERVOIR AND SUPPLEMENTAL RESERVOIR, AND A BRAKE CYLINDER DEVICE, A FLUID PRESSURE BRAKE CONTROLLING VALVE DEVICE COMPRISING: (A) A SERVICE VALVE PORTION OPERATIVE IN RESPONSE TO REDUCTION FROM THE NORMALLY CHARGED PRESSURE IN THE BRAKE PIPE AT A SERVICE RATE TO EFFECT THE SUPPLY OF FLUID UNDER PRESSURE FROM THE AUXILIARY RESERVOIR TO THE BRAKE CYLINDER DEVICE TO CAUSE A SERVICE APPLICATION OF THE BRAKES, AND
Claim 2
Dependent Claim
82 words
IN A FLUID PRESSURE BRAKER SYSTEM OF THE TYPE INCLUDING A NORMALLY CHARGED BRAKE PIPE, AUXILLIARY RESERVOIR AND SUPPLEMENTAL RESERVOIR, AND A BRAKE CYLINDER DEVICE, A FLUID PRESSURE BRAKE CONTROLLING VALVE DEVICE COMPRISING: (A) A SERVICE VALVE PORTION OPERATIVE IN RESPONSE TO REDUCTION FROM THE NORMALLY CHARGED PRESSURE IN THE BRAKE PIPE AT A SERVICE RATE TO EFFECT THE SUPPLY OF FLUID UNDER PRESSURE FROM THE AUXILIARY RESERVOIR TO THE BRAKE CYLINDER DEVICE TO CAUSE A SERVICE APPLICATION OF THE BRAKES, AND
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) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |