| 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 = '451') AND (category.subclass = '247') ORDER BY date ASC, patent, type |
Total of 3 patents found where: Class is '451'; Subclass is '247';
View a patent by clicking on the patent number. You can sort by any of the columns by clicking on the column name.
| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1916 | ||||||
| U | 1,171,205 | February 8, 1916 | Process of Manufacturing Porcelain Articles Method of forming the shape of a spark plug insulator from a dry blank |
JEFFERY, Joseph Arthur JEFFERY, Benjamin Alfred |
Manufacturing | |
| U | 1,186,203 | June 6, 1916 | Apparatus for Use in Manufacturing Articles of Ceramic Material Method of manufacturing spark plugs |
JEFFERY, Joseph A. JEFFERY, Benjamin A. |
Manufacturing | |
| 1944 | ||||||
| U | 2,355,684 | August 15, 1944 | Insulator Cutting Machine Machine to automatically trim the profile in insulators in an assembly line process |
SKIPPER, Edward M. |
Machine | Locke Insulator Corp. |
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