| SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN name ON name.patent = patent.patent AND name.type = patent.type WHERE (last_name = 'STEWARD') AND (first_name = 'Demetrius M.') ORDER BY date ASC, patent, type |
Total of 3 patents found where: Last Name is 'STEWARD'; First Name is 'Demetrius M.';
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| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1883 | ||||||
| U | 271,994 | February 6, 1883 | Electrical Insulator Method of treating steatite to make artificial lava insulation |
STEWARD, Demetrius M. |
Lava | |
| 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 | |
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