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
CA859784A
Inventor
Maeda Yo
Suzuki Yasuo
Kimura Minondo
Itoh Seiichi
Miyagi Toru
Nakamura Shuhei
Kitagawa Hiroshi
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.)
Showa Denko Materials Co ltd
Original Assignee
Hitachi Chemical Co Ltd
Publication date
Application grantedgrantedCritical
Publication of CA859784ApublicationCriticalpatent/CA859784A/en