Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885597 | Non-impact printer apparatus with improved current mirror driver and method of printing | Pin S. Tschang, Kenneth D. Kieffer | 1989-12-05 |
| 4875057 | Modular optical printhead for hard copy printers | Edwin A. Hediger, Yee S. Ng | 1989-10-17 |
| 4831395 | Printer apparatus | Yee S. Ng, Kenneth D. Kieffer, Pin S. Tschang, Eric K. Zeise | 1989-05-16 |