|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 = '57') ORDER BY description DESC, date, patent, type|
Total of 1 patents found where: Class is '501'; Subclass is '57';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||64,196||April 30, 1867||Improvement in the Manufacture of Porcelain
Mixing cryolite, chiolite, and fluellite with sand and other common compounds for making glass in order to make a substance that looks similar to porcelain, but is actually glass that can be cast and formed like glass.
|CHEYNEY, Waldron J.
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