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
Priority claimed from JP4250947Aexternal-prioritypatent/JP2793449B2/ja
Priority claimed from JP25094992Aexternal-prioritypatent/JP3235799B2/ja
Priority claimed from JP25600592Aexternal-prioritypatent/JP3093050B2/ja
Application filed by Sumitomo Bakelite CofiledCriticalSumitomo Bakelite Co
Application grantedgrantedCritical
Publication of TW272981BpublicationCriticalpatent/TW272981B/zh