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
CA894304A
Inventor
Fujisawa Mitsumaro
Koide Masashi
Yamamoto Sadao
Hatakeyama Shigeyuki
Sato Wasuke
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.)
Resonac Holdings Corp
Original Assignee
Showa Denko KK
Publication date
Application grantedgrantedCritical
Publication of CA894304ApublicationCriticalpatent/CA894304A/en