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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 = '28') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '52'; Subclass is '28';

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T / S Patent Date Description Patentee Category Assigned To
 1963
U 3,113,728 December 10, 1963 Artificial Light and Daylighting Structure
Artificical Light that looks like a glass block		 BOYD, Robert A.
 OI Owens-Illinois Glass Co.

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