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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 = '149') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '501'; Subclass is '149';

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T / S Patent Date Description Patentee Category Assigned To
 1925
U 1,561,002 November 10, 1925 Method of Producing Clay Bodies and Apparatus Used
Vacuum process for removing air from the clay		 LAPP, Grover W.
 Vacuum Lapp Insulator Co., Inc.
 1926
U 1,569,251 January 12, 1926 Method of Preparing Clay or Body Composition for Ceramic Articles
Method of preparing plastic clay without the use of filter presses by mixing dry ingredients with water, filtering, and evaporation of water with heat and vacuum before sending to the pug mill		 AUSTIN, Arthur O.
 Manufacturing The Ohio Brass Co.
U 1,589,617 June 22, 1926 Process for Preparing Material for Ceramic Articles
Vacuum pugging after mixing dry ingredients with exact percent water needed		 AUSTIN, Arthur O.
 Vacuum The Ohio Brass Co.

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