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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 = '106') AND (category.subclass = '277') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '106'; Subclass is '277';

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T / S Patent Date Description Patentee Category Assigned To
 1974
U 3,836,705 September 17, 1974 Electrical Insulator and Conducting Tar Therefore
RFI prevention using conductive tar to coat insulator and metal surfaces for cementing		 ROSENBLATT, Gordon
 RFI Canadian Porcelain Co.

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