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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 = '501') AND (category.subclass = '27') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '501'; Subclass is '27';

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T / S Patent Date Description Patentee Category Assigned To
 1915
U 1,136,504 April 20, 1915 Glass and Art of Making the Same
Glass made from cullet with lime and clay added		 BROOKFIELD, Henry M.
 Glass  
 1927
U 1,626,042 April 26, 1927 Glass
Boro-silicate glass		 LOCKE, Fred M.
 Boron  

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