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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 = '451') AND (category.subclass = '41') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '451'; Subclass is '41';

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T / S Patent Date Description Patentee Category Assigned To
 1916
U 1,171,205 February 8, 1916 Process of Manufacturing Porcelain Articles
Method of forming the shape of a spark plug insulator from a dry blank		 JEFFERY, Joseph Arthur
JEFFERY, Benjamin Alfred
 Manufacturing  

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