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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 = '501') AND (category.subclass = '26') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '501'; Subclass is '26';

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T / S Patent Date Description Patentee Category Assigned To
U Specimen known 2,157,100 May 9, 1939 Glazed Ceramic Insulator and the Like
Glaze - compression glaze
ROWLAND, Davidge H.
Glaze Locke Insulator Corp.
U 3,368,026 February 6, 1968 Electrical Insulator Having Improved Surface Electrical Stress Distribution
RFI prevention using two glaze coatings on suspension insulators
VINCE, Patrick Michael
RFI Doulton & Co., Ltd.

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