Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8348546 | Method for transferring a barrier | James B. Welch, Douglas E. Wilkinson, Patrick A. Leonhardt, Barry D. Stephens, Sean Thompson +1 more | 2013-01-08 |
| 8109692 | Barrier transfer device, system and method for the use thereof | James B. Welch, Douglas E. Wilkinson, Patrick A. Leonhardt, Barry D. Stephens, Sean Thompson +1 more | 2012-02-07 |
| RE41988 | Highway crash cushion and components thereof | John V. Machado | 2010-12-07 |
| 7758277 | Crash cushion | John F. La Turner, Douglas E. Wilkinson | 2010-07-20 |
| 7484906 | Crash cushion | John F. La Turner, Douglas E. Wilkinson | 2009-02-03 |
| 7396184 | Crash cushion | John F. La Turner, Douglas E. Wilkinson | 2008-07-08 |
| 6142452 | Highway barrier and guardrail | Owen S. Denman, Patrick A. Leonhardt, James B. Welch, Lincoln C. Cobb | 2000-11-07 |
| 5967497 | Highway barrier and guardrail | Owen S. Denman, Patrick A. Leonhardt, James B. Welch, Lincoln C. Cobb | 1999-10-19 |
| 5868521 | Highway crash cushion and components thereof | David C. Gertz, John V. Machado, Barry D. Stephens | 1999-02-09 |
| 5733062 | Highway crash cushion and components thereof | John V. Machado | 1998-03-31 |
| 5577861 | Crash attenuator with vehicle-deflecting member | John V. Machado | 1996-11-26 |
| 5494371 | Crash attenuator | John V. Machado | 1996-02-27 |