| 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 = '122') ORDER BY date ASC, patent, type |
Total of 3 patents found where: Class is '501'; Subclass is '122';
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| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1906 | ||||||
| U | 816,270 | March 27, 1906 | Refractory Material for Electric Insulation and Other Purposes Insulating material made of steatite and water glass known as artificial lava |
STEWARD, Demetrius M. |
Misc | |
| U | 816,271 | March 27, 1906 | Process of Producing New Refractory Material for the Manufacture of Insulators and Other Uses Insulating material made of steatite and water glass known as artificial lava |
STEWARD, Demetrius M. |
Misc | |
| 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. |
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