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 = '431') AND (category.subclass = '168') ORDER BY specimen DESC, date, patent, type |
Total of 1 patents found where: Class is '431'; Subclass is '168';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
1907 | ||||||
U | 866,787 | September 24, 1907 | Furnace Producer gas furnace combined with boiler |
HEMINGRAY, Ralph G. JENSEN, John O. |
HI |
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