Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7964817 | Electrical discharge machine apparatus for reverse taper bores | — | 2011-06-21 |
| 7019247 | Electrical discharge machine apparatus with piezo-electric head | — | 2006-03-28 |
| 4846504 | Secure on-pack promotional coupons | Frank J. Welch, Kenneth Lin | 1989-07-11 |
| 4398414 | Electrical friction sleeve cone penetrometer | — | 1983-08-16 |