Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA878549A
Inventor
Yamagishi Kazuo
Kageyama Osamu
Masaki Hideaki
Arai Hideo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daicel Corp
Original Assignee
Daicel Corp
Publication date
Application grantedgrantedCritical
Publication of CA878549ApublicationCriticalpatent/CA878549A/en