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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 = '264') AND (category.subclass = '504') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '264'; Subclass is '504';

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T / S Patent Date Description Patentee Category Assigned To
 1905
U 790,214 May 16, 1905 Method of Manufacturing High Potential Earthenware Insulators
Earthenware, manufacture of hi-potential insulators
LOCKE, Fred M.
Earthenware  

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