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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') ORDER BY description ASC, date, patent, type

Total of 7 patents found where: Class is '451';

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T / S Patent Date Description Patentee Category Assigned To
 1917
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  
 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.
 1933
U 1,904,608 April 18, 1933 Insulator Finishing Brushing Machine
Machine to grind down interlinking passages in a semi-dry insulator body for metal fittings
BETTINI, David
Manufacturing Locke Insulator Corp.
 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  
 1870
U 108,408 October 18, 1870 Improvement in Cutting and Engraving Stone, Metal, Glass &c.
Method of sandblashing to cut or engrave
TILGHMAN, Benjamin C.
Engraving  
 1869
U 98,270 December 28, 1869 Improvement in Machine for Grinding Glass Jars
Use of adjustable arms to grind the mouth of glass jars
KELLY, Alexander W.
SAMUEL, John B.
Jar  

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