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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 = '402') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '427'; Subclass is '402';

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T / S Patent Date Description Patentee Category Assigned To
 1849
U 6,907 November 27, 1849 Improvement in Glazing Pottery-Ware
Transparent and colored glaze for pottery and stone ware		 FENTON, Christopher W.
 Flint  

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