Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871401 | Fluidized bed method of forming a nitride or carbonitride layer | Junji Endo, Hiromasa Takeda | 1989-10-03 |
| 4844949 | Method of surface treatment and apparatus used therefor | Junji Endo, Hiromasa Takeda | 1989-07-04 |
| 4818351 | Method for the surface treatment of an iron or iron alloy article | Hironori Fujita, Yoshihiko Sugimoto, Yukio Ohta, Shigeo Moriyama, Akira Sato | 1989-04-04 |
| 4804445 | Method for the surface treatment of an iron or iron alloy article | Yukio Ohta, Shigeo Moriyama, Akira Sato, Hironori Fujita, Yoshihiko Sugimoto | 1989-02-14 |