Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4839445 | Spherical particles of thermosetting phenolic resin and process for producing the same | Yoshiaki Echigo, Kenichi Sugawara, Yoshiyuki Suematu, Keiichi Asami, Tuneyuki Ohsawa | 1989-06-13 |
| 4808316 | Process for treating waste water containing uranium and fluorine | Keiichiro Otomura, Yoshikazu Ogura, Yoshiaki Echigo, Tadashi Ishikura | 1989-02-28 |