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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 = '309.3') ORDER BY patent ASC, type

Total of 2 patents found where: Class is '52'; Subclass is '309.3';

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T / S Patent Date Description Patentee Category Assigned To
 1958
U 2,835,623 May 20, 1958 Method of Forming a Unitary Panel of Glass Blocks
Pre-assembled glass block windows and skylight panels
VINCENT, Harold B.
MCDAVITT, Murray
OI Owens-Illinois Glass Co.
 1962
U 3,070,474 December 25, 1962 Bonded Glass Surfaces and Method Therefore
Masonry bonding grit for glass block
SMITH, Robert M.
OI Owens-Illinois Glass Co.

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