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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 = '313') AND (category.subclass = '147') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '313'; Subclass is '147';

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T / S Patent Date Description Patentee Category Assigned To
U 1,099,421 June 9, 1914 High Voltage Switch
High voltage switch mounted on multipart insulators composed of triangle shaped metal rods and insulators that rotate to open or close the switch.
BURKE, Alfred Woodard
U 1,127,043 February 2, 1915 Electric Arc Extinguisher
Use of explosive to break the arcing around a multipart insulator (see 1,116,303)
LOCKE, Fred M.
U 2,011,136 August 13, 1935 Protective Apparatus
Arcing gap using flux control insulators
AUSTIN, Arthur O.
Arc Gap The Ohio Brass Co.

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