Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9815400 | Headlight control device and headlight | Takahito Nishii, Koichi Kato, Kazuya Asaoka, Sho Masuda | 2017-11-14 |
| 7800174 | Power semiconductor switching-device and semiconductor power module using the device | Motoo Yamaguchi, Yutaka Tomatsu | 2010-09-21 |
| 7755295 | Vehicle head lamp device | Yuji Kajita | 2010-07-13 |
| 6452219 | Insulated gate bipolar transistor and method of fabricating the same | Yoshiyuki Miyase, Haruo Kawakita, Naoto Okabe | 2002-09-17 |
| 6281546 | Insulated gate field effect transistor and manufacturing method of the same | Yoshihiko Ozeki, Naoto Okabe | 2001-08-28 |
| 5973338 | Insulated gate type bipolar-transistor | Naoto Okabe, Norihito Tokura | 1999-10-26 |
| 5723882 | Insulated gate field effect transistor having guard ring regions | Naoto Okabe | 1998-03-03 |
| 5719412 | Insulated gate bipolar transistor | Naoto Okabe | 1998-02-17 |
| 5621234 | Vertical semiconductor device with breakdown voltage improvement region | — | 1997-04-15 |
| 5609145 | Internal combustion engine ignition system | Masami Kojima | 1997-03-11 |
| 5519245 | Insulated gate bipolar transistor with reverse conducting current | Norihito Tokura, Naoto Okabe | 1996-05-21 |
| 5510634 | Insulated gate bipolar transistor | Naoto Okabe | 1996-04-23 |
| 5475258 | Power semiconductor device with protective element | Etsuji Toyoda, Naoto Okabe | 1995-12-12 |
| 5464992 | Insulated gate bipolar transistor provided with a minority carrier extracting layer | Naoto Okabe, Tsuyoshi Yamamoto | 1995-11-07 |
| 5169793 | Method of making an insulated gate bipolar transistor having gate shield region | Naoto Okabe, Tsuyoshi Yamamoto | 1992-12-08 |
| 4994880 | Semiconductor device constituting bipolar transistor | Yoshiyuki Miyase, Tomoatsu Makino, Kasuhiro Yamada, Masami Yamaoka, Takeshi Matsui +3 more | 1991-02-19 |