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.)
Kureha Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Kureha Corp
Nippon Telegraph and Telephone Corp
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 Kureha Corp, Nippon Telegraph and Telephone CorpfiledCriticalKureha Corp
Priority to JP7783878ApriorityCriticalpatent/JPS557521A/ja
Publication of JPS557521ApublicationCriticalpatent/JPS557521A/ja
Publication of JPS5760317B2publicationCriticalpatent/JPS5760317B2/ja