Issued Patents All Time
Showing 26–32 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5548073 | Water-soluble azo compounds | Akira Ogiso, Rihoko Imai, Hisato Itoh | 1996-08-20 |
| 5482986 | Benzopyran compound and use of the same | Akira Ogiso, Rihoko Imai, Hisato Itoh | 1996-01-09 |
| 5446135 | Sulfonyloxy substituted tris-azoaryl dyes and copper complex salts thereof and polarizing films dyed therewith | Akira Ogiso, Rihoko Imai, Hisato Itoh | 1995-08-29 |
| 5423100 | Water-soluble azo compounds and polarizing films using the compounds | Akira Ogiso, Rihoko Imai, Hisato Itoh | 1995-06-13 |
| 5382465 | Anthraquinonic colorant and polarizing film containing the colorant | Hisato Itoh, Tsutomu Nishizawa, Masami Nakano, Hiroyuki Katayama | 1995-01-17 |
| 5318856 | Water-soluble azo dyes and polarizing films using the dyes | Akira Ogiso, Rihoko Imai, Hisato Itoh | 1994-06-07 |
| 5252769 | Anthraquinonic colorant and polarizing film containing the colorant | Hisato Itoh, Tsutomu Nishizawa, Masami Nakano, Hiroyuki Katayama | 1993-10-12 |