Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4849368 | Method of producing a two-dimensional electron gas semiconductor device | Yoshimi Yamashita, Hidetoshi Ishiwari, Sumio Yamamoto, Shigeru Kuroda | 1989-07-18 |
| 4742379 | HEMT with etch-stop | Yoshimi Yamashita, Hidetoshi Ishiwari, Sumio Yamamoto, Shigeru Kuroda | 1988-05-03 |
| 4578343 | Method for producing field effect type semiconductor device | Yoshimi Yamashita, Noriaki Nakayama, Sumio Yamamoto | 1986-03-25 |
| 4427991 | High frequency semiconductor device | Shigeyuki Yamamura, Takao Shima, Norio Hidaka | 1984-01-24 |