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Home › Process for producing highly pure 3,3',4,4'-biphenyltetracarboxylic acid or dianhydride thereof

Process for producing highly pure 3,3',4,4'-biphenyltetracarboxylic acid or dianhydride thereof

US Patent 5047560 · Granted Sep 10, 1991

Estimated economic value: $36,000 ⓘ

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