Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4801518 | Method of forming a photoresist pattern | Yoshio Yamashita, Toshio Itoh, Takateru Asano, Kenji Kobayashi | 1989-01-31 |
| 4609615 | Process for forming pattern with negative resist using quinone diazide compound | Yoshio Yamashita | 1986-09-02 |
| 4600684 | Process for forming a negative resist using high energy beam | Yoshio Yamashita | 1986-07-15 |
| 4278754 | Resists and method of manufacturing semiconductor elements by using the same | Yoshio Yamashita, Mitsumasa Kunishi | 1981-07-14 |