Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4941260 | Utility knife | — | 1990-07-17 |
| 4858319 | Apparatus for ensuring that a knife is opened in a desired orientation | — | 1989-08-22 |
| 4813132 | Utility knife | — | 1989-03-21 |
| 4517741 | Knife with plural replaceable blade storage and means for single blade extension | — | 1985-05-21 |
| 4223055 | Multi-layer graphic arts tape system | Michael I. Rackman | 1980-09-16 |
| 4182789 | Multi-layer graphic arts tape system | — | 1980-01-08 |