Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6992227 | Process for producing 1, 1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane | Kenji Ekawa, Yoichiro Isota, Toru Nakaguchi | 2006-01-31 |
| 6972344 | Method of producing pure 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane | Kenji Ekawa | 2005-12-06 |
| 6875896 | Method for producing high purity 1,1-bis(4-hydroxyphenyl)cyclohexanes | Tooru Nakaguchi, Kenji Ekawa | 2005-04-05 |
| 6720460 | Hydroxyphenyl adamantanes and process for the production of the same | Akira Yoshikawa, Kenji Ekawa, Kentaro Watanabe, Miwa Hazama | 2004-04-13 |
| 6673975 | Method for producing 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane | Kenji Ekawa, Yoichiro Isota, Toru Nakaguchi | 2004-01-06 |
| 6673973 | Method of producing 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane | Kenji Ekawa, Yoichiro Isota, Toru Nakaguchi | 2004-01-06 |
| 6673974 | Process for production of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane | Kenji Ekawa, Yoichiro Isota, Toru Nakaguchi | 2004-01-06 |
| 6512149 | Method for removing butyl groups from butyl phenol compounds | Mitsuhiro Higashi, Kenji Ekawa | 2003-01-28 |
| 6284931 | Process for producing 3, 3, 5-trimethylcyclohexylidenebisphenol | Yoichiro Isota, Toru Nakaguchi, Hiroshi Takenaka | 2001-09-04 |
| 6118029 | Process for producing 3,3',5,5'-tetra-t butylbiphenol | Yoichiro Isota, Mikio Kawahara | 2000-09-12 |