Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889567 | High strength and high toughness steel bar, rod and wire and the process of producing the same | Tadayoshi Fujiwara, Yukio Yamaoka, Kazuichi Hamada, Yasunobu Kawaguchi, Yasuhiro Oki +2 more | 1989-12-26 |
| 4872758 | Film thickness-measuring apparatus | Takao Miyazaki, Isamu Komine | 1989-10-10 |
| 4850711 | Film thickness-measuring apparatus using linearly polarized light | Kazuo Sano, Takao Miyazaki | 1989-07-25 |