Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6579034 | Highway crash attenuator frame | James B. Welch | 2003-06-17 |
| 6481920 | Highway crash cushion | Patrick A. Leonhardt, John V. Machado | 2002-11-19 |
| 6244637 | Adjustable tailgate mount for truck mounted attenuator | Patrick A. Leonhardt, John V. Machado, Michael J. Buehler | 2001-06-12 |
| 6142452 | Highway barrier and guardrail | Owen S. Denman, Patrick A. Leonhardt, Michael H. Oberth, James B. Welch | 2000-11-07 |
| 6092959 | Method for decelerating a vehicle, highway crash cushion, and energy absorbing element therefor | Patrick A. Leonhardt, John V. Machado | 2000-07-25 |
| 5967497 | Highway barrier and guardrail | Owen S. Denman, Patrick A. Leonhardt, Michael H. Oberth, James B. Welch | 1999-10-19 |
| 5054954 | Roadway barrier | Teddy J. Hirsch | 1991-10-08 |
| 4423854 | Roadway barrier | Raymond A. Wardell | 1984-01-03 |