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Priority claimed from CH1497665Aexternal-prioritypatent/CH428677A/de
Priority claimed from CH1497865Aexternal-prioritypatent/CH453697A/fr
Application filed by Фридрих Грюндсшобер , Жорж Самбет Швейцари, Иностранна фирма Родиасета А. О. франциfiledCriticalФридрих Грюндсшобер , Жорж Самбет Швейцари
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Publication of SU433686A3publicationCriticalpatent/SU433686A3/ru
Process for preparing soluble polyimide by the polycondensation of mellophanic dianhydride pyromellitic dianhydrid eand an aromatic diami nefollowed by imidation of the polycondensation product