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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 = '313') AND (category.subclass = '54') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '313'; Subclass is '54';

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T / S Patent Date Description Patentee Category Assigned To
 1953
U 2,644,026 June 30, 1953 Radioactive Lightning Protector with Accelerating Elements
Lightning rod with porcelain disk coated with radioactive material		 GRENIER, Joseph Pierre
LESCIEUX, Pierre Edouard Eugene
 Lightning Rod Ste. Helita

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