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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 = '238') AND (category.subclass = '84') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '238'; Subclass is '84';

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T / S Patent Date Description Patentee Category Assigned To
 1925
U 1,556,570 October 6, 1925 Impregnated Wood and Process of Treating Wood
Treating wood pins and the like under high temperature with Montan wax and a solvent that penetrates the grain and protects it from weather and decay		 COOLIDGE, Joseph R.
 Pin Montan, Inc.

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