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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 = '264') AND (category.subclass = '267') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '264'; Subclass is '267';

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T / S Patent Date Description Patentee Category Assigned To
U 2,142,422 January 3, 1939 Insulator and Method of Manufacturing the Same
Method of making station post insulators with hollow cavity and filling cavity with dry gas
Insulator The Ohio Brass Co.

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