Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5292130 | Golf driving mat | — | 1994-03-08 |
| 5265964 | Lubricant system for a rotary cone rock bit | — | 1993-11-30 |
| 5188462 | Lubricant system for a rotary cone rock bit | Donald F. Wilcock | 1993-02-23 |
| 5148879 | Spindle cap bearing for rotary cone rock bits | — | 1992-09-22 |
| 4793719 | Precision roller bearing rock bits | David P. Crockett, Gerard P. Erpenbeck | 1988-12-27 |