Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6325844 | Filter and muffler device for vacuum mechanism | William S. Lindsay | 2001-12-04 |
| 5616157 | Visible restricted filter indicator | Deborah V. Beebe | 1997-04-01 |
| 5163519 | Pneumatically driven reverse impact device | Alvin L. Knoll | 1992-11-17 |