Patent US3304131A successfully refreshed from Google Patents.
US3304131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protector valve for a trailer brake system
Assignee: Echlin Inc
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Filing: 1964-08-27
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Granted: 1967-02-14
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Expires: 1984-08-27
Abstract
No abstract record available.
Inventors
- 👤 Richard C Bueler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:44
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/40; B60T13/403; B60T15/00; B60T15/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
206 words
A TRAILER PROTECTOR VALVE HAVING EMERGENCY INLET AND RESERVOIR PORTS ADAPTED TO BE CONNECTED TO MAIN AND AUXILIARY PRESSURE FLUID SOURCES, SERVICE INLET AND OUTLET PORTS ADAPTED TO BE CONNECTED TO APPLICATION AND BRAKE ACTUATING MEANS, EMERGENCY CONTROL MEANS MOVABLE BETWEEN FIRST AND SECOND POSITIONS FOR CONTROLLING PRESSURE FLUID COMMUNICATION BETWEEN SAID SERVICE OUTLET PORT AND SAID SERVICE INLET AND RESERVOIR PORTS IN RESPONSE TO INCREASE AND REDUCTION OF FLUID PRESSURE ABOVE AND BELOW A PREDETERMINED MAGNITUDE ACTING ON A PRESSURE RESPONSIVE AREA OF SAID EMERGENCY CONTROL MEANS, AND RELEASE CONTROL MEANS INTERPOSED BETWEEN SAID EMERGENCY INLET AND RESERVOIR PORTS AND INCLUDING A STEPPED FIRST CHAMBER CONNECTED TO SAID EMERGENCY INLET PORT, PLUNGER MEANS SLIDABLE IN SAID FIRST CHAMBER AND INCLUDING A LARGE DIAMETER PISTON MEMBER, AN INTERMEDIATE DIAMETER MEMBER ON ONE SIDE OF SAID LARGE PISTON MEMBER FORMING A SMALL AREA THEREBETWEEN IN COMMUNICATION WITH SAID PRESSURE RESPONSIVE AREA OF SAID EMERGENCY CONTROL MEANS, AND A SMALL DIAMETER PISTON MEMBER ON THE OTHER SIDE OF SAID LARGE PISTON MEMBER FORMING A LARGE AREA IN COMMUNICATION WITH SAID FIRST CHAMBER, MANUAL MEANS EXTENDING FROM SAID INTERMEDIATE MEMBER EXTERNALLY OF SAID TRAILER PROTECTOR VALVE, A SECOND CHAMBER ADJACENT TO SAID FIRST CHAMBER AND CONNECTED THEREWITH BY FIRST
Claim 2
Dependent Claim
206 words
A TRAILER PROTECTOR VALVE HAVING EMERGENCY INLET AND RESERVOIR PORTS ADAPTED TO BE CONNECTED TO MAIN AND AUXILIARY PRESSURE FLUID SOURCES, SERVICE INLET AND OUTLET PORTS ADAPTED TO BE CONNECTED TO APPLICATION AND BRAKE ACTUATING MEANS, EMERGENCY CONTROL MEANS MOVABLE BETWEEN FIRST AND SECOND POSITIONS FOR CONTROLLING PRESSURE FLUID COMMUNICATION BETWEEN SAID SERVICE OUTLET PORT AND SAID SERVICE INLET AND RESERVOIR PORTS IN RESPONSE TO INCREASE AND REDUCTION OF FLUID PRESSURE ABOVE AND BELOW A PREDETERMINED MAGNITUDE ACTING ON A PRESSURE RESPONSIVE AREA OF SAID EMERGENCY CONTROL MEANS, AND RELEASE CONTROL MEANS INTERPOSED BETWEEN SAID EMERGENCY INLET AND RESERVOIR PORTS AND INCLUDING A STEPPED FIRST CHAMBER CONNECTED TO SAID EMERGENCY INLET PORT, PLUNGER MEANS SLIDABLE IN SAID FIRST CHAMBER AND INCLUDING A LARGE DIAMETER PISTON MEMBER, AN INTERMEDIATE DIAMETER MEMBER ON ONE SIDE OF SAID LARGE PISTON MEMBER FORMING A SMALL AREA THEREBETWEEN IN COMMUNICATION WITH SAID PRESSURE RESPONSIVE AREA OF SAID EMERGENCY CONTROL MEANS, AND A SMALL DIAMETER PISTON MEMBER ON THE OTHER SIDE OF SAID LARGE PISTON MEMBER FORMING A LARGE AREA IN COMMUNICATION WITH SAID FIRST CHAMBER, MANUAL MEANS EXTENDING FROM SAID INTERMEDIATE MEMBER EXTERNALLY OF SAID TRAILER PROTECTOR VALVE, A SECOND CHAMBER ADJACENT TO SAID FIRST CHAMBER AND CONNECTED THEREWITH BY FIRST
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) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |