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
CA903021A
Inventor
Ogawa Masao
Horibe Teisuke
Hayashi Shigeo
Takeuchi Gunji
Sato Wasuke
Morimoto Ichiro
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 CA903021ApublicationCriticalpatent/CA903021A/en