Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5934386 | Small diameter impact boring tool impact head | William P. Hnat, Robert L. Collins, Songnian Wang | 1999-08-10 |
| 5918687 | Small diameter impact boring tool | William P. Hnat, Robert L. Collins, Songnian Wang | 1999-07-06 |
| 5816342 | Small diameter impact boring tool | William P. Hnat, Robert L. Collins, Songnian Wang | 1998-10-06 |