Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874436 | Method for producing high purity electrolytic copper | Takashi Ogata, Masanori Kato, Yoshio Kawasumi, Kanji Tanaka | 1989-10-17 |
| 4816748 | Electronic thermohygrometer with square-wave pulse signal generator | Isao TAZAWA, Norihiro Kiuchi, Hideo Segawa, Kenji Murakami | 1989-03-28 |