Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877391 | Apparatus for scoring rigid plastic sheet material | Edward E. Batson | 1989-10-31 |
| 4828137 | Plastic closure with score lines | Edward E. Batson | 1989-05-09 |
| 4818461 | Method for scoring rigid plastic sheet material | Edward E. Batson | 1989-04-04 |