|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 = '423') AND (category.subclass = '630') ORDER BY type DESC, date, patent|
Total of 1 patents found where: Class is '423'; Subclass is '630';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||1,312,053||August 5, 1919||Process of Decomposing Potassium Silicates
Process of extracting potassium to be used in glass manufacture (see patent 1,327,781; 1,327,782)
|SCHOLES, Samuel R.
||Glass||H. C. Fry Glass Co.|
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