Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6179297 | Seal | Walter Douglas Bauman, James B. Chamberlin, Mark Steven Jeffries, Jack Roach | 2001-01-30 |
| 5913391 | Damper | Mark Steven Jeffries, Maurice Ladd | 1999-06-22 |
| 5579874 | Adjustable speed gas spring | Mark Steven Jeffries, James B. Chamberlin | 1996-12-03 |