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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 = '264') AND (category.subclass = '87') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '264'; Subclass is '87';

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T / S Patent Date Description Patentee Category Assigned To
 1922
U Specimen known 1,424,924 August 8, 1922 Method of Producing Clay Bodies
Vacuum process for removing air from the clay. Patent was owned by Lapp Insulator Co.		 LAPP, Grover W.
 Vacuum  
 1928
U 1,693,429 November 27, 1928 Method of Casting
Manufacturing method to cast bushings with a hollow core		 AUSTIN, Arthur O.
 Manufacturing The Ohio Brass Co.
 1929
U 1,717,996 June 18, 1929 Means for and Method of Making Insulators
Press method of molding porcelain insulator with vibration improves quality (Hewlett)		 MOORE, JR., Stewart L.
 Press Locke Insulator Corp.

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