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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 = '318') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '264'; Subclass is '318';

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T / S Patent Date Description Patentee Category Assigned To
 1917
U 1,227,680 May 29, 1917 Method of Screw-Threading Articles Made of Horn
Method of threading insulators made of animal horn (see 1,333,188)
SEGRE, Mario
Horn  
 1937
U 2,068,941 January 26, 1937 Process and Apparatus for Manufacturing Insulators
Plunger to first form the pinhole in a porcelain insulator by first plunging a pinhole without threads then form the threads
BOVARD, Floyd G.
Press The Ohio Brass Co.

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