Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7304182 | Crystalline parahydroxybenzoic acid anhydride and process for preparing the same | Ryuzo Ueno, Masaya Kitayama, Masaharu Kittaka | 2007-12-04 |
| 6673962 | Granule of parahydroxybenzoic acid or parahydroxybenzoic ester and process for producing the same | Ryuzo Ueno, Masaya Kitayama, Masaharu Kittaka | 2004-01-06 |
| 6562998 | Granules of 2-hydroxynaphthalene-3-carboxylic acid and method for preparing the same | Ryuzo Ueno, Masaya Kitayama, Syungo Nara, Masaharu Kittaka | 2003-05-13 |
| 6403827 | Crystal of 2-hydroxynaphthalene-3-carboxylic acid and process for the preparation thereof | Ryuzo Ueno, Masaya Kitayama, Hiroyuki Kato | 2002-06-11 |