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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 = '238') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '427'; Subclass is '238';

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T / S Patent Date Description Patentee Category Assigned To
 1927
U 1,621,016 March 15, 1927 Method of and Means for Coating Inner Surfaces of Hollow Bodies
Manufacturing method of spraying gummy coating to the inside of the cement joint of an insulator		 JACKSON, Ray P.
 Manufacturing Westinghouse Electric & Mfg. Co.

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