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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 = '428') AND (category.subclass = '149') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '428'; Subclass is '149';

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T / S Patent Date Description Patentee Category Assigned To
 1943
U 2,327,972 August 24, 1943 High Strength Ceramic Surface
Manufacturing method of 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 2,337,691)		 STETTINIUS, Kenneth E.
DEWEY, Benjamin F.
 Manufacturing Lapp Insulator Co., Inc.

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