US3558156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic vehicle leveling system including electrically operated pump down compressor
Assignee: Motors Liquidation Co
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Filing: 1969-05-01
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Granted: 1971-01-26
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Expires: 1989-05-01
Abstract
Abstract IN PREFERRED FORM, AN AUTOMATIC VEHILE LEVELING SYSTEM INCLUDING A FLUID SPRING BETWEEN THE CHASSIS AND THE AXLE ASSEMBLY THAT IS SELECTIVELY CONNECTED TO A PRECHARGED PRESSURE TANK THROUGH A CLOSED LOOP SUPPLY SYSTEM INCLUDING A HEIGHT CONTROLLER HAVING THREE POSITION VALVE MEANS. AN ELECTRICALLY OPERATED COMPRESOR WITHIN THE STORAGE TANK IN COOPERATION WITH THE MULTI-POSITION HEIGHT CONTROLER PRODUCES A RAPID PUMP DOWN OF THE FLUID SPRING WHEN STATIC LOAD IS REMOVED. CONCURRENTLY THE COMPRESSOR WILL PRECHARGE THE TANK FOR SUBSEQUENT LEVELING USE WHEN THE VEHICLE CHASSIS IS LOADED.
Inventors
- 👤 George W Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:36
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/0152; B60G17/0155; B60G2500/00; B60G2500/20; B60G2500/201; B60G2500/2014
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |