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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 = '236') AND (category.subclass = '68B') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '236'; Subclass is '68B';

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T / S Patent Date Description Patentee Category Assigned To
 1966
U 3,243,505 March 29, 1966 Insulator Having Semi-Conductive Layers to Increase the Capacitance Thereof
Fog type suspension with conductive layers on top and bottom of disk		 CLARK, Colin H. W.
 Fog Steatite and Porcelain Products, LTD.

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