Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874354 | Method and apparatus for automatically opening bags | Robert B. Johnson | 1989-10-17 |
| 4795413 | Method and apparatus for automatically opening bags | Robert B. Johnson | 1989-01-03 |