Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7304182 | Crystalline parahydroxybenzoic acid anhydride and process for preparing the same | Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi | 2007-12-04 |
| 6673962 | Granule of parahydroxybenzoic acid or parahydroxybenzoic ester and process for producing the same | Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi | 2004-01-06 |
| 6562998 | Granules of 2-hydroxynaphthalene-3-carboxylic acid and method for preparing the same | Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi, Syungo Nara | 2003-05-13 |
| 6239263 | Water-soluble azo compounds and process for the preparation thereof | Ryuzo Ueno, Masaya Kitayama, Kenji Minami | 2001-05-29 |
| 6020470 | Water-soluble azo compounds and process for producing the same | Ryuzo Ueno, Masaya Kitayama, Kenji Minami | 2000-02-01 |