Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4586837 | Ink ribbon cartridge indication system for printer | Shepard D. Johnson, Andrew J. French, Allan Ellis, Dennis Hedrick | 1986-05-06 |
CH
Charles D. Helfenberger
Overall (All Time): #3,995,089 of 4,157,543Top 100%
1
Patents All Time