Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10137725 | Telescoping writing implement | Jeffrey L. Kelsoe | 2018-11-27 |
| 9415625 | Telescoping writing implement | Jeffrey L. Kelsoe | 2016-08-16 |
| 4881088 | Plotter pen ink level detector | Wiebe Hilles van der Meer | 1989-11-14 |
| 4789399 | Pressurized roller pens and inks for such pens | Raymond S. Williams | 1988-12-06 |
| 4419464 | Erasable ink for ball point pens | Raymond S. Williams | 1983-12-06 |
| 4367966 | Erasable ink for ball point pens comprising trifluoroethylene and vinyl acetate polymers | Raymond S. Williams | 1983-01-11 |