Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6088560 | Liquid ink replenishment system for liquid electrographic imaging devices | James E. Zenk, Mark A. Sanner, Russell A. Roiko, James A. Baker, Christopher J. Anton +3 more | 2000-07-11 |
| 6041805 | Valve assembly for a removable ink cartridge | Russell A. Roiko, James E. Zenk, Kay F. Schilli | 2000-03-28 |
| 5970273 | Ink cartridge for liquid electrographic imaging devices | James E. Zenk, Mark A. Sanner, Russell A. Roiko, Kay F. Schilli | 1999-10-19 |