Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4752995 | Manufacture of pistons | David A. Parker, Michael L. Rhodes | 1988-06-28 |
| D286780 | Piston | David A. Parker | 1986-11-18 |
| D286781 | Piston | David A. Parker | 1986-11-18 |
| 4535682 | Pistons | David A. Parker | 1985-08-20 |