Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6325384 | Tank piston with improved seal and wiper | Christopher K. Duncan | 2001-12-04 |
| 6027123 | Tank piston with improved seal and wiper | Christopher K. Duncan | 2000-02-22 |
| 5236291 | Multi-tooth drill with improved chisel edge | John S. Agapiou | 1993-08-17 |