Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4628326 | Apparatus for preventing drying-up of drawing needle pens | Sadaaki Fukumura, Takeji Hashimoto | 1986-12-09 |
| 4621428 | Pen tip cleaning assembly of plotter | Sadaaki Fukumura, Etsuji Tagami, Takeji Hashimoto | 1986-11-11 |