Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4839445 | Spherical particles of thermosetting phenolic resin and process for producing the same | Yoshiaki Echigo, Kenichi Sugawara, Mutsunori Yamao, Yoshiyuki Suematu, Tuneyuki Ohsawa | 1989-06-13 |