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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 = '524') AND (category.subclass = '71') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '524'; Subclass is '71';

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T / S Patent Date Description Patentee Category Assigned To
 1887
U 362,076 May 3, 1887 Composition for Insulating and Other Purposes
Composition formula of Gilsonite		 GILSON, Samuel H.
 Composition 1/2 to George Goss, Sr.

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