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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 = '427') AND (category.subclass = '58') ORDER BY type ASC, date, patent

Total of 3 patents found where: Class is '427'; Subclass is '58';

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T / S Patent Date Description Patentee Category Assigned To
 1871
U 114,911 May 16, 1871 Improvement in Galvanic Batteries
Use of paraffin or paraffinic oil to coat surface of battery acid to prevent evaporation
BROOKS, David
Battery  
 1935
U 1,987,683 January 15, 1935 Insulator
RFI: coat crown with copper glaze to prevent AM radio interference
HUNT, Marsden H.
BARROW, George M.
RFI Westinghouse Electric & Mfg. Co.
 1942
U 2,274,955 March 3, 1942 High Tension Electric Insulator and Method of Coating Same
RFI: antimony coated top
DYKSTRA, Laurence J.
MEYER, Edwin M.
RFI Victor Insulators, Inc.

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