Hercofina

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4398037 Process for producing aromatic carboxylic acids and methyl esters thereofExpiredNov 09, 81Aug 09, 83[C07C]
4394286 Partially hydrolyzed, DMT process residue, and useful propylene oxide derivative thereofExpiredMay 20, 81Jul 19, 83[C09K, C08G, C08F, C07C]
4353810 Minimizing iron in recovered oxidation catalyst material in DMT processExpiredJan 21, 81Oct 12, 82[C07C, B01J, C01G]
4345089 Recovery of aromatic carboxylic acid or ester thereof from residue fraction of oxidation or esterification reaction mixtureExpiredApr 28, 80Aug 17, 82[C07C]
4284760 Process for the manufacture of unsaturated polyester resinsExpiredMar 13, 80Aug 18, 81[C08G]
4227010 Recovery of dimethyl terephthalate and intermediates from the tarry fraction of cooxidation process residueExpiredOct 13, 78Oct 07, 80[C07C]
4187902 Heat exchange apparatusExpiredOct 13, 71Feb 12, 80[F28F]

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