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 = '153') ORDER BY category DESC, date, patent, type |
Total of 3 patents found where: Class is '501'; Subclass is '153';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
Porcelain | ||||||
U | 1,631,730 | June 7, 1927 | Ceramic Material Porcelain composition for spark plugs and insulators consisting of Sillimanite |
JEFFERY, Joseph A. MONTGOMERY, Earle T. |
Porcelain | Champion Porcelain Co. |
U | 4,332,913 | June 1, 1982 | Flux Combination of Barium Oxide and Potassium Feldspar for High Strength Alumina Porcelain Electric Insulators Porcelain composition with low shrinkage during firing |
BOCK, Peter |
Porcelain | Rosenthal Technik AG |
Feldspar | ||||||
R | 12,992 | July 13, 1909 | Manufacture of Spar Insulators Feldspar insulator material (reissue of 907,155) |
LOCKE, Fred M. |
Feldspar |
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