Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877535 | Iron dispersant for boiler water | Kenji Kobayashi, Ichiro Kaneko, Shinji Nakano | 1989-10-31 |
| 4820573 | Fiber glass mainly composed of calcium phosphate | Hideo Tagai, Shigeo Niwa, Hiroyasu Takeuchi, Mikiya Ono | 1989-04-11 |
| 4796653 | Method of enhancing residual compressive stress in double metallic tubes | Akitake Matsushita, Hitoshi Nakamura, Shinji Tanaka, Shuji Furuya | 1989-01-10 |