Issued Patents 1982
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4319949 | Machine for heat sealing polymeric sheets into a spiral drum | Christopher P. Thissen, Jerry J. Ferwerda, Ronald D. Hatfield | 1982-03-16 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4319949 | Machine for heat sealing polymeric sheets into a spiral drum | Christopher P. Thissen, Jerry J. Ferwerda, Ronald D. Hatfield | 1982-03-16 |