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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 = '404') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '427'; Subclass is '404';

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T / S Patent Date Description Patentee Category Assigned To
 1941
U 2,264,152 November 25, 1941 Method of Forming a Metallic Surface on Ceramic Bodies
RFI metallic coating that strongly adheres to the insulator		 ROWLAND, Davidge H.
 RFI Locke Insulator Corp.

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