Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7749105 | Golf club head with insert having indicia therein | Donovan D. Zielke, Roger Twibell | 2010-07-06 |
| 5182468 | Current limiting clamp circuit | Charles K. Erdelyi, Mark Gregory Marshall, Patrick E. Perry | 1993-01-26 |
| D328012 | Combined golfer's beverage and scorecard holder | Fred G. Witte | 1992-07-21 |