Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857137 | Process for surface treatment | Shinichi Tachi, Kazunori Tsujimoto, Kiichiro Mukai | 1989-08-15 |
| 4844767 | Method of and apparatus for etching | Shigeru Nishimatsi, Keizo Suzuki, Ken Ninomiya | 1989-07-04 |