Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9200171 | AZO compound and ink containing the compound | Utako Takeda, Yuki Tanaka, Hiroyuki Aikyo, Mio Ishida | 2015-12-01 |
| 8747537 | Ink containing heterocyclic azo dye, and dye for use in said ink | Yasushi Shiga, Utako Takeda, Mio Ishida | 2014-06-10 |