Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5897300 | Quick-release bolt for use with pump housing | — | 1999-04-27 |
| 5630711 | Peristaltic pump having a loop-shaped tube path | Gary W. Pritchard, Craig J. Shields | 1997-05-20 |
| 5307840 | Ink tank/pump system | Gerald N. Shields | 1994-05-03 |
| 4817649 | Parts washer device | Robert E. Schmalz, Jr., Timothy E. Owens | 1989-04-04 |