Issued Patents All Time
Showing 1–25 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7048834 | Method for purification of acrylic acid | Yoshitake Ishii, Kouji Ueno, Kazuhiko Sakamoto, Sei Nakahara, Tetsuji Mitsumoto +3 more | 2006-05-23 |
| 6966973 | Apparatus and process for producing (meth)acrylic acid | Sei Nakahara, Kazuhiko Sakamoto, Yukihiro Matsumoto, Kenji Sanada | 2005-11-22 |
| 6787001 | Method for distilling (meth) acrylic acid solution | Kazuhiko Sakamoto, Sei Nakahara, Yukihiro Matsumoto, Kenji Sanada | 2004-09-07 |
| 6706208 | Stabilized hydroxyalkyl (meth)acrylate | Tokumasa Ishida, Yasuhiro Shingai | 2004-03-16 |
| 6695928 | Method for production of (meth) acrylic acid and/or (meth)acrylic esters | Sei Nakahara, Takeshi Nishimura | 2004-02-24 |
| 6664418 | Method for inhibiting polymerization of a vinyl compound | Kazuhiko Sakamoto, Kazuo Ohkouchi, Masahiro Uemura, Sei Nakahara | 2003-12-16 |
| 6660881 | Process for producing (meth)acrylic ester | Hajime Matsumoto, Tetsuya Kajihara, Yasuhiro Shingai, Yukihiro Yoneda, Masahiro Uemura +2 more | 2003-12-09 |
| 6649787 | Method for preparing (meth) acrylic acid ester | Sei Nakahara | 2003-11-18 |
| 6649028 | Column treating process and apparatus thereof | Kazuhiko Sakamoto, Sei Nakahara, Naoto Kasaya | 2003-11-18 |
| 6540881 | Method for refining (meth)acrylic acid | Kazuhiko Sakamoto, Kouji Ueno, Sei Nakahara | 2003-04-01 |
| 6482981 | Method for producing acrylic acid | Kouji Ueno, Sei Nakahara | 2002-11-19 |
| 6469202 | Method for disposal of solid catalyst | Sei Nakahara, Takeshi Nishimura, Masahiro Motofuji | 2002-10-22 |
| 6458988 | Production process for hydroxyalkyl(meth)acrylate | Hajime Matsumoto, Tokumasa Ishida, Yasuhiro Shingai, Yukihiro Yoneda | 2002-10-01 |
| 6452040 | Production process for hydroxyalkyl (meth)acrylate | Yasuhiro Shingai, Sei Nakahara, Yukihiro Yoneda, Masakazu Asami | 2002-09-17 |
| 6441228 | Apparatus and process for producing (meth)acrylic acid | Sei Nakahara, Kazuhiko Sakamoto, Yukihiro Matsumoto, Kenji Sanada | 2002-08-27 |
| 6414183 | Method for handling waste oil | Kazuhiko Sakamoto, Sei Nakahara | 2002-07-02 |
| 6414182 | Production process for hydroxyalkyl ester | Yasuhiro Shingai, Tokumasa Ishida, Fumio Shibusawa, Tetsuya Kajihara, Yukihiro Yoneda +1 more | 2002-07-02 |
| 6384267 | Process for producing hydroxyalkyl (METH) acrylates | Yasuhiro Shingai, Junya Watanabe, Hirohisa Kubota | 2002-05-07 |
| 6380424 | Purification process for hydroxyalkyl (meth)acrylate | Yukihiro Yoneda, Fumio Shibusawa, Yasuhiro Shingai | 2002-04-30 |
| 6348135 | Process for the purification of (meth) acrylic acid and/or its ester | Sei Nakahara, Yukihiro Matsumoto | 2002-02-19 |
| 6300513 | Method of stabilizing N-oxyl compounds in vinyl compounds | Kazuhiko Sakamoto, Naoki Serata, Kouji Ueno, Sei Nakahara | 2001-10-09 |
| 6252110 | Methods for recovering acrylic acid | Masahiro Uemura, Takahiro Takeda | 2001-06-26 |
| 6084127 | Method for recovering acrylic acid | Kazuhiko Sakamoto, Fumio Shibusawa, Sei Nakahara, Takahiro Takeda | 2000-07-04 |
| 5785821 | Process for the production of acrylic acid | Kazuhiko Sakamoto, Sei Nakahara, Takahiro Takeda, Yohji Akazawa | 1998-07-28 |
| 5504243 | Method for inhibiting polymerization of (meth) acrylic acid and esters thereof | Kazuhiko Sakamoto, Takahiro Takeda, Yoji Akazawa, Masao Baba | 1996-04-02 |