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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 = '425') AND (category.subclass = '269') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '425'; Subclass is '269';

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T / S Patent Date Description Patentee Category Assigned To
 1941
U 2,261,583 November 4, 1941 Method of Making Hollow Forms
Method of casting hollow forms		 HEMPHILL, James R.
 Manufacturing The Colonial Insulator Co.

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