Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5231886 | Non-metallic gear shaker | Michael J. Quirk, John E. Zarycki | 1993-08-03 |
| D323514 | Shaker | Michael J. Quirk | 1992-01-28 |
| 4942776 | Non-metallic gear shaker | Michael J. Quirk, John E. Zarycki | 1990-07-24 |
| 4870870 | Shaker | Michael J. Quirk | 1989-10-03 |
| 4696357 | Packer/weigh-scale | David E. Beehler, Timothy E. Hawk | 1987-09-29 |