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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 = '52') AND (category.subclass = '441') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '52'; Subclass is '441';

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T / S Patent Date Description Patentee Category Assigned To
 1961
U 3,012,378 December 12, 1961 Light Transmitting Blocks
Glass Block		 BOYD, Robert A.
 OI Owens-Illinois Glass Co.

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