Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837849 | Stand-up plastic bag and method of making same | Laurence R. Erickson, Roger D. Vrooman | 1989-06-06 |
| 4829745 | Tube spreader for removing wrinkles in tube stock | Larry M. Zieke | 1989-05-16 |
| 4812192 | Process and apparatus for cutting and sealing multiple plies of thermoplastic material having thickened sections | Timothy R. Woods | 1989-03-14 |