Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7520341 | Drill head assembly | — | 2009-04-21 |
| 7513319 | Reamer bit | — | 2009-04-07 |
| 7273431 | Impact measuring game ball | — | 2007-09-25 |
| 7228922 | Drill bit | — | 2007-06-12 |
| 6695071 | Drill head assembly | — | 2004-02-24 |
| 5195598 | Drill head assembly | — | 1993-03-23 |
| 4506501 | Apparatus for repairing chains | Hu D. DeVall, Clarence L. Tennant | 1985-03-26 |
| 4478248 | Rotary valve | Hu D. DeVall | 1984-10-23 |
| 4416337 | Drill head assembly | Albert A. Phillips, Hu D. DeVall | 1983-11-22 |