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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 = '123') ORDER BY date ASC, patent, type

Total of 5 patents found where: Class is '427'; Subclass is '123';

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T / S Patent Date Description Patentee Category Assigned To
U 1,973,076 September 11, 1934 Insulator
RFI: coat crown with gold, platinum, bismuth & semi-conductive area
HUNT, Marsden H.
RFI Westinghouse Electric & Mfg. Co.
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.
U 2,264,152 November 25, 1941 Method of Forming a Metallic Surface on Ceramic Bodies
RFI metallic coating that strongly adheres to the insulator
ROWLAND, Davidge H.
RFI Locke Insulator Corp.
U 2,283,685 May 19, 1942 High Resistance Conducting Coating for Electric Insulators
RFI coating to prevent radio interference
RFI The Ohio Brass Co.
U 2,867,551 January 6, 1959 Apparatus and Method for Applying Conductive Coatings to Insulators
Radio treatment process for CD 239
RFI Owens-Illinois Glass Co.

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