|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|
|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
|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.
|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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