Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870433 | Thermal drop-on-demand ink jet print head | Alan Stirling Campbell, Francis Chee-Shuen Lee, Graham Olive | 1989-09-26 |
| 4847636 | Thermal drop-on-demand ink jet print head | Robert C. Durbeck, Francis Chee-Shuen Lee, Graham Olive | 1989-07-11 |