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SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN category ON category.patent = patent.patent AND category.type = patent.type WHERE (category.class = '521') AND (category.subclass = '91') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '521'; Subclass is '91';

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T / S Patent Date Description Patentee Category Assigned To
 1950
U 2,514,141 July 4, 1950 Polyester Resin Adhesive Compositions
Cement composed of polyester resin and sand for attaching metal parts to suspension and other insulators		 PHILLIPS, Dorothea S.
 Cement American Cyanamid Co.

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