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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 = '427') AND (category.subclass = '193') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '427'; Subclass is '193';

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T / S Patent Date Description Patentee Category Assigned To
 1943
U 2,337,691 December 28, 1943 Method of Making High Strength Ceramic Surfaces
Method of manufacturing insulators using porcelain ""sand"" with a lower coefficient of expansion than the insulator body to rough up the surface and provide a strong cement joint without reducing the effectiveness of the compression glaze (see 2,327,972)		 STETTINIUS, Kenneth E.
DEWEY, Benjamin F.
 Manufacturing Lapp Insulator Co., Inc.

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