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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 = '592.4') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '52'; Subclass is '592.4';

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T / S Patent Date Description Patentee Category Assigned To
 1934
U 1,949,898 March 6, 1934 Building Block
Various forms of glass window block		 COCHRANE, Samuel S.
KADOW, August
 OI Owens-Illinois Glass Co.

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