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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 = '106') AND (category.subclass = '815') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '106'; Subclass is '815';

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T / S Patent Date Description Patentee Category Assigned To
 1867
U 61,390 January 22, 1867 Improved Compound for Telegraph Insulators, and for Other Purposes
Heating earthenware insulators to 400-500 degrees and dipping into asphaltic compound that has been mixed with sulfur, silicic acid, and silicate of alumina to provide a hard, weather-resistant coating		 BOYNTON, John F.
 Coating  

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