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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 = '215') AND (category.subclass = 'DIG6') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '215'; Subclass is 'DIG6';

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T / S Patent Date Description Patentee Category Assigned To
 1963
U 3,093,508 June 11, 1963 Method of Coating Glass
Silicone coated glass that can be used for insulators		 WARTENBERG, Erwin W.
 Glass Coating  

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