Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4789399 | Pressurized roller pens and inks for such pens | Paul C. Fisher | 1988-12-06 |
| 4419464 | Erasable ink for ball point pens | Paul C. Fisher | 1983-12-06 |
| 4367966 | Erasable ink for ball point pens comprising trifluoroethylene and vinyl acetate polymers | Paul C. Fisher | 1983-01-11 |