Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4701389 | Photoconductive toner | Yumiko Sano, Eiji Nimura, Yuji Tomii, Tatsuo Maeda | 1987-10-20 |
| 4634646 | Method for the formation of electrophotographic images | Yumiko Sano | 1987-01-06 |