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.)
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.)
Idemitsu Petrochemical Co Ltd
Nippon Tokushu Togyo KK
Niterra Co Ltd
Original Assignee
Idemitsu Petrochemical Co Ltd
NGK Spark Plug Co Ltd
Nippon Tokushu Togyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Idemitsu Petrochemical Co Ltd, NGK Spark Plug Co Ltd, Nippon Tokushu Togyo KKfiledCriticalIdemitsu Petrochemical Co Ltd
Priority to JP2-508677ApriorityCriticalpatent/JPH07108831B2/ja
Publication of JPWO1990015787A1publicationCriticalpatent/JPWO1990015787A1/ja
Publication of JPH07108831B2publicationCriticalpatent/JPH07108831B2/ja
Publication of JPH07108831B1publicationCriticalpatent/JPH07108831B1/ja