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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 = '437') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '52'; Subclass is '437';

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T / S Patent Date Description Patentee Category Assigned To
 1938
U 2,114,732 April 19, 1938 Building Block
Blocks with corrugated edges		 ANDEREGG, Frederick O.
 OI Owens-Illinois Glass Co.
 1958
U 2,844,998 July 29, 1958 Glass Building Block Having Light Directing Properties
Glass block that directs light		 VINCENT, Harvard B.
 OI Owens-Illinois Glass Co.

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