| 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 = '264') AND (category.subclass = '681') ORDER BY date ASC, patent, type |
Total of 2 patents found where: Class is '264'; Subclass is '681';
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| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1912 | ||||||
| U | 1,049,005 | December 31, 1912 | Insulating Composition and Process of Making the Same Artificial reconstructed lava made from combining soapstone or talc (hydrated silicate of magnesia), with a binder which is the precipitate of a mixture of magnesium sulfate and sodium silicate. The combination is then molded to the desired shape and fired at 1000 to 1300 degrees centigrade or higher. |
STEINMETZ, Charles P. |
Composition | General Electric Co. |
| 1942 | ||||||
| U | 2,301,939 | November 17, 1942 | Production of Ceramic Bodies Press to make a very dense porcelain body. It is neither wet process nor dry process porcelain. The product was called ""Prestite"" porcelain. |
FISCHER, Eugene H. |
Press | Westinghouse Electric & Mfg. Co. |
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