|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 = '337') ORDER BY date ASC, patent, type|
Total of 1 patents found where: Class is '427'; Subclass is '337';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||1,128,747||February 16, 1915||Method of Manufacturing Porcelain Insulators
Manufacturing process for porcelain insulator firing unglazed, then filling porous porcelain with oxidizable oil and rendering the oil stable with ozone to form a coating to replace expense of firing on a glaze
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