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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 = '287') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '427'; Subclass is '287';

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T / S Patent Date Description Patentee Category Assigned To
 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 2,281,173 April 28, 1942 Insulator and Method of Producing Conducting Coating Thereon
RFI prevention using an inexpensive glaze coating		 SANTOMIERI, Sebastian L.
 RFI Victor Insulators, Inc.

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