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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 = '209') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '209';

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T / S Patent Date Description Patentee Category Assigned To
 1904
U 771,557 October 4, 1904 Apparatus for Screening Liquid Clay
miscellaneous apparatus for screening liquid clay
LOCKE, Fred M.
Miscellaneous  
 1925
U 1,528,908 March 10, 1925 Process of Forming Ceramic Products
Process of adding reagents to accelerate hardening of the clay to reduce the time body is in mold
BLEININGER, Albert V.
Manufacturing 1/2 to Frank H. Riddle

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