Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8960698 | Suspension arrangement for a vehicle | — | 2015-02-24 |
| 8919795 | Separated primary spring and secondary leaf suspension for vehicle | — | 2014-12-30 |
| 8882120 | Primary air spring and secondary leaf suspension for vehicle | Slawomir M. Zieleniec, Graham R. Brookes | 2014-11-11 |
| 8668215 | Dual leaf suspension for vehicle drive arrangement | — | 2014-03-11 |
| 8490992 | Dual leaf vehicle suspension with J-shaped spring element | — | 2013-07-23 |
| 6619637 | Leaf spring arrangement for automotive vehicle | — | 2003-09-16 |
| 5129633 | Hydraulic actuator for parallel auxiliary leaf springs | Erlen B. Walton, David M. Preston, James L. Oliver | 1992-07-14 |
| 5098121 | Vehicle suspension with auiliary leaf springs | Erlen B. Walton, David M. Preston, James L. Oliver | 1992-03-24 |
| 5035408 | Jounce responsive actuator for parallel auxiliary spring | Erlen B. Walton, David M. Preston, James L. Oliver | 1991-07-30 |
| 5029893 | Vehicle suspension with auxiliary leaf springs | Erlen B. Walton, David M. Preston, James L. Oliver | 1991-07-09 |
| 5024463 | Manually power mechanical actuator for parallel auxiliary spring | James L. Oliver, Erlen B. Walton, David M. Preston | 1991-06-18 |
| 4982972 | Hydraulic pump and actuator for parallel auxiliary leaf spring | David M. Preston, Erlen B. Walton, James L. Oliver | 1991-01-08 |