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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';

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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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