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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 = '337') AND (category.subclass = '276') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '337'; Subclass is '276';

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T / S Patent Date Description Patentee Category Assigned To
 1906
U 816,270 March 27, 1906 Refractory Material for Electric Insulation and Other Purposes
Insulating material made of steatite and water glass known as artificial lava		 STEWARD, Demetrius M.
 Misc  
U 816,271 March 27, 1906 Process of Producing New Refractory Material for the Manufacture of Insulators and Other Uses
Insulating material made of steatite and water glass known as artificial lava		 STEWARD, Demetrius M.
 Misc  

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