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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 = '264') AND (category.subclass = '639') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '264'; Subclass is '639';

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T / S Patent Date Description Patentee Category Assigned To
 1944
U 2,346,620 April 11, 1944 Method of Forming Insulator Bodies
Method to mix water with dry ingredients to form clay of the proper water content		 SKIPPER, Edward M.
 Clay Locke Insulator Corp.

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