Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874727 | Particulate lead titanate ceramic and composite material containing same | Tsutomu Tsunooka, Koji Ogura, Hirofumi Ozeki, Takashi Yamamoto | 1989-10-17 |
| 4869111 | Cyclic fatigue testing apparatus | Kohji Ogura | 1989-09-26 |