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 = '73') AND (category.subclass = '439') ORDER BY assigned_to ASC, date, patent, type |
Total of 1 patents found where: Class is '73'; Subclass is '439';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
Locke Insulator Corp. | ||||||
U | 1,822,458 | September 8, 1931 | Measuring Apparatus Device to measure the density of clay slip |
ROWLAND, Davidge H. ROBERTSON, John C. |
Manufacturing | Locke Insulator Corp. |
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