Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4319949 | Machine for heat sealing polymeric sheets into a spiral drum | Christopher P. Thissen, Milford J. Tweet, Ronald D. Hatfield | 1982-03-16 |
| 4284396 | Apparatus for vacuum thermoforming polymeric sheet material | Christopher P. Thissen, Milford J. Tweet, Ronald D. Hatfield | 1981-08-18 |