Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885136 | Method of anticorrosive treatment for soft water boilers | Hirohiko Katayama, Toshihiko Mukai, Yoshinari Kawasaki | 1989-12-05 |
| 4866081 | Microbicidal preservative composition | Yosuke Ito, Yasuhiro Nomura | 1989-09-12 |
| 4839373 | Quaternary ammonium and benzothiazole microbicidal preservative composition | Yosuke Ito, Yasuhiro Nomura | 1989-06-13 |
| 4814406 | Scale inhibitor | Tadahiko Asano, Masatsune Okuma, Keisyo Nakanishi | 1989-03-21 |