Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873162 | X-ray mask and a manufacture method therefor | Nobuo Fujiwara, Yaichirou Watakabe | 1989-10-10 |
| 4865952 | Method of forming a T-shaped control electrode through an X-ray mask | Noriaki Ishio | 1989-09-12 |