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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 = '501') AND (category.subclass = '56') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '501'; Subclass is '56';

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T / S Patent Date Description Patentee Category Assigned To
 1917
U 1,226,088 May 15, 1917 Insulator and Composition Material for Insulating and Other Purposes
Boro-silicate glass		 LOCKE, Fred M.
 Boron  

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