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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 = '524') AND (category.subclass = '575.5') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '524'; Subclass is '575.5';

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T / S Patent Date Description Patentee Category Assigned To
 1881
U 243,782 July 5, 1881 Compound Substance for Electric Insulators
Composition for hard rubber for insulators		 MAYALL, Thomas J.
 Composition  
 1939
U 2,146,596 February 7, 1939 Rubber Insulating Compound and Method of Making the Same
Rubber compound for electrical conductors		 SCHWARTZ, Emil W.
SAVAGE, Manuel H.
SPARGO, Francis C.
 Rubber General Electric Co.

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