SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN name ON name.patent = patent.patent AND name.type = patent.type LEFT JOIN category ON category.patent = patent.patent AND category.type = patent.type WHERE (category.class = '451') AND (category.subclass = '246') ORDER BY last_name ASC, first_name, date, patent, type |
Total of 1 patents found where: Class is '451'; Subclass is '246';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
JEFFERY, Joseph A. JEFFERY, Benjamin A. | ||||||
U | 1,223,792 | April 24, 1917 | Apparatus for Use in Manufacturing Articles of Ceramic Material Machine for manufacturing spark plugs |
JEFFERY, Joseph A. JEFFERY, Benjamin A. |
Manufacturing |
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