Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5106881 | Water base pigment ink compositions for use in marking pens | Hiroshi Inoue, Yasuji Okuda | 1992-04-21 |
| 5009536 | Water base pigment ink compositions for use in marking pens | Hiroshi Inoue, Yasuji Okuda | 1991-04-23 |
| 4942185 | Water base pigment ink compositions for use in marking pens | Hiroshi Inoue, Yasuji Okuda | 1990-07-17 |