Patents per Year
Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 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 | $13,807,000 |
| D328012 | Combined golfer's beverage and scorecard holder | Fred G. Witte | 1992-07-21 |