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
CA854621A
Inventor
Yokoyama Hiroshi
Nakayama Chozo
Ito Shigeo
Hirai Tooru
Kobayashi Hidehiko
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.)
Asahi Kasei Corp
Original Assignee
Asahi Kasei Kogyo KK
Publication date
Application grantedgrantedCritical
Publication of CA854621ApublicationCriticalpatent/CA854621A/en