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
CA903133A
Inventor
Usuba Kunikatsu
Otake Naokichi
Yamanobe Yutaka
Siina Katumi
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.)
Kureha Corp
Original Assignee
Kureha Corp
Publication date
Application grantedgrantedCritical
Publication of CA903133ApublicationCriticalpatent/CA903133A/en