Patent information:

Patent:Utility 1,171,205
Patented:February 8, 1916
Applied:August 18, 1909
Title:Process of Manufacturing Porcelain Articles
Description:Method of forming the shape of a spark plug insulator from a dry blank
Category:Manufacturing
Assigned to: 

Patentee Information:

JEFFERY, Joseph Arthur Newark, NJ
JEFFERY, Benjamin Alfred Newark, NJ

Class and subclass information:

Class:264PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES
Subclass:679OUTSIDE OF MOLD SINTERING OR VITRIFYING OF SHAPED INORGANIC ARTICLE OR PREFORM Of clay containing material;
Class:451ABRADING
Subclass:167 
Class:451ABRADING
Subclass:247 
Class:451ABRADING
Subclass:41 

Known specimens:

None known

Drawings:

Drawing page 1

Page 1

Drawing page 2

Page 2