Patent US3158409A successfully refreshed from Google Patents.
US3158409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake control system for railway trains
Assignee: SPX Technologies Inc
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Filing: 1961-09-18
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Granted: 1964-11-24
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Expires: 1981-09-18
Abstract
No abstract record available.
Inventors
- 👤 Hughson J Donald
- 👤 Sydney W Freeman
- 👤 Percy W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:11
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/18; B60T15/184; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86389; Y10T137/87048
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A SYSTEM FOR OPERATING THE BRAKES OF A TRAIN OF RAILROAD CARS COMPRISING A PRESSURE RESERVOIR ON EACH CAR FOR SUPPLYING AIR UNDER PRESSURE TO ITS RESPECTIVE BRAKE CYLINDER, A BRAKE PIPE EXTENDING THE LENGTH OF THE TRAIN AND HAVING BRANCH LINES OPERATIVELY CONNECTED TO EACH OF THE PRESSURE RESEVOIRS, MEANS FOR SUPPLYING AIR UNDER PRESSURE TO EACH OF SAID RESERVOIRS THROUGH SAID BRAKE PIPE TO CHARGE SAID BRAKE PIPE AND RESERVOIRS WITH GAS OF A PREDETERMINED PRESSURE, VALVE MEANS COMMUNICATING WITH THE INTERIOR OF SAID BRAKE PIPE EFFECTIVE WHEN OPERATED TO INTRODUCE GAS INTO SAID BRAKE PIPE AT A PRESSURE IN EXCESS OF SAID PREDETERMINED PRESSURE, MEANS EFFECTIVE TO OPERATE SAID VALVE MEANS REPEATEDLY TO INTRODUCE A SERIES OF BLASTS OF SAID GAS INTO SAID BRAKE PIPE, RECEIVING MEANS ON EACH CAR OPERATIVELY CONNECTED TO SAID BRAKE PIPE AND SAID RESERVOIR EFFECTIVE UPON SENSING SAID SERIES OF BLASTS TO CAUSE AIR FROM SAID RESERVOIR TO BE SUPPLIED TO SAID BRAKE CYLINDER FOR OPERATING THE BRAKES OF THE TRAIN.
Claim 2
Independent Claim
169 words
A SYSTEM FOR OPERATING THE BRAKES OF A TRAIN OF RAILROAD CARS COMPRISING A PRESSURE RESERVOIR ON EACH CAR FOR SUPPLYING AIR UNDER PRESSURE TO ITS RESPECTIVE BRAKE CYLINDER, A BRAKE PIPE EXTENDING THE LENGTH OF THE TRAIN AND HAVING BRANCH LINES OPERATIVELY CONNECTED TO EACH OF THE PRESSURE RESEVOIRS, MEANS FOR SUPPLYING AIR UNDER PRESSURE TO EACH OF SAID RESERVOIRS THROUGH SAID BRAKE PIPE TO CHARGE SAID BRAKE PIPE AND RESERVOIRS WITH GAS OF A PREDETERMINED PRESSURE, VALVE MEANS COMMUNICATING WITH THE INTERIOR OF SAID BRAKE PIPE EFFECTIVE WHEN OPERATED TO INTRODUCE GAS INTO SAID BRAKE PIPE AT A PRESSURE IN EXCESS OF SAID PREDETERMINED PRESSURE, MEANS EFFECTIVE TO OPERATE SAID VALVE MEANS REPEATEDLY TO INTRODUCE A SERIES OF BLASTS OF SAID GAS INTO SAID BRAKE PIPE, RECEIVING MEANS ON EACH CAR OPERATIVELY CONNECTED TO SAID BRAKE PIPE AND SAID RESERVOIR EFFECTIVE UPON SENSING SAID SERIES OF BLASTS TO CAUSE AIR FROM SAID RESERVOIR TO BE SUPPLIED TO SAID BRAKE CYLINDER FOR OPERATING THE BRAKES OF THE TRAIN.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |