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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 = '450') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '428'; Subclass is '450';

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T / S Patent Date Description Patentee Category Assigned To
 1942
U 2,274,955 March 3, 1942 High Tension Electric Insulator and Method of Coating Same
RFI: antimony coated top		 DYKSTRA, Laurence J.
MEYER, Edwin M.
 RFI Victor Insulators, Inc.

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