Patent US3666324A successfully refreshed from Google Patents.
US3666324A
Expired / Lapsed
US
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Vehicle braking systems
Assignee: Wabco Automotive UK Ltd
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Filing: 1969-12-08
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Granted: 1972-05-30
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Expires: 1989-12-08
Abstract
Abstract A VEHICLE BRAKING SYSTEM FOR TRACTOR-TRAILER COMBINATIONS AND WHICH INCLUDES AIR PRESSURE-OPERATED BRAKE UNITS AND SPRING-ACTUATED, AIR PRESSURE-RELEASE BRAKE UNITS COMPRISES A MANUALLY-OPERABLE CONTROL UNIT INCORPORATING TWO GRADUATED PRESSURE VALVES CONTROLLING RESPECTIVELY THE APPLICATION OF THE SPRING BRAKE UNITS AND THE AUXILIARY LINE TO THE TRAILER BRAKES, AND AN "ON-OFF" VALVE FOR VENTING ALL AIR LINES TO ALL BRAKE UNITS.
Inventors
- 👤 Wilbur M Page
- 👤 Ralph Coupland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:06
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/04; B60T15/041; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/261; B60T13/263
Claims Analysis
Total Claims: 0
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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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |