Issued Patents All Time
Showing 26–50 of 50 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7048834 | Method for purification of acrylic acid | Yoshitake Ishii, Kazuhiko Sakamoto, Sei Nakahara, Masatoshi Ueoka, Tetsuji Mitsumoto +3 more | 2006-05-23 |
| 6540881 | Method for refining (meth)acrylic acid | Kazuhiko Sakamoto, Sei Nakahara, Masatoshi Ueoka | 2003-04-01 |
| 6482981 | Method for producing acrylic acid | Masatoshi Ueoka, Sei Nakahara | 2002-11-19 |
| 6300513 | Method of stabilizing N-oxyl compounds in vinyl compounds | Kazuhiko Sakamoto, Naoki Serata, Sei Nakahara, Masatoshi Ueoka | 2001-10-09 |
| 5781627 | Semiconductor integrated circuit device with copy-preventive function | Nobuo Ikuta, Kouji Shishido, Yutaka Fukutani, Youji Arayama, Tomohiro Nakayama +4 more | 1998-07-14 |
| 5268864 | Programmable memory device having programming current absorbing transistors | Yoshiyuki Fujita, Yuji Tsuchimoto | 1993-12-07 |
| 4972375 | Programmable semiconductor memory circuit | Yasurou Matsuzaki, Yuji Tsuchimoto | 1990-11-20 |
| 4972372 | Programmable device and method of testing programmable device | — | 1990-11-20 |
| 4835590 | Semiconductor memory device using junction short type programmable element | Takamitsu Naito, Yoshitaka Nakajima | 1989-05-30 |
| 4800529 | Semiconductive memory device with current control and comparison means to reduce power consumption and increase operating speed | — | 1989-01-24 |
| 4625129 | Electronic circuit device having a power supply level switching circuit | — | 1986-11-25 |
| 4617653 | Semiconductor memory device utilizing multi-stage decoding | Yasuro Matsuzaki, Toshitaka Fukushima | 1986-10-14 |
| 4599688 | Semiconductor memory device having switching circuit for preventing channel leakage in constant current source | Tamio Miyamura | 1986-07-08 |
| 4536858 | Junction short-circuiting-type programmable read-only memory device | — | 1985-08-20 |
| 4488261 | Field programmable device | Tamio Miyamura | 1984-12-11 |
| 4482914 | Contact structure of semiconductor device | Toru MANO, Takeshi Fukuda, Toshitaka Fukushima, Kazuo Tanaka | 1984-11-13 |
| 4459694 | Field programmable device with circuitry for detecting poor insulation between adjacent word lines | Toshitaka Fukushima, Kazumi Koyama | 1984-07-10 |
| 4429388 | Field programmable device with internal dynamic test circuit | Toshitaka Fukushima, Kazumi Koyama | 1984-01-31 |
| 4424582 | Semiconductor memory device | Toshitaka Fukushima, Kazumi Koyama, Tamio Miyamura, Yuichi Kawabata | 1984-01-03 |
| 4376984 | Programmable read-only memory device | Toshitaka Fukushima, Kazumi Koyama | 1983-03-15 |
| 4347584 | Programmable read-only memory device | Toshitaka Fukushima, Kazumi Koyama, Yuichi Kawabata, Tamio Miyamura | 1982-08-31 |
| 4322640 | Three-state output circuit | Toshitaka Fukushima | 1982-03-30 |
| 4320507 | Field programmable device having test provisions for fault detection | Toshitaka Fukushima, Kazumi Koyama | 1982-03-16 |
| 4319300 | Surge arrester assembly | John J. Napiorkowski, Raymond D. Jones, Toshitaka Fukushima, Kazumi Koyama, Tamio Miyamura +1 more | 1982-03-09 |
| 4319341 | Programming circuit for permanently storing data in a programmable read only memory | Toshitaka Fukushima, Kazumi Koyama, Tamio Miyamura, Yuichi Kawabata | 1982-03-09 |