Patent information:

Patent:Utility 788,120
Patented:April 25, 1905
Applied:July 21, 1904
Title:Press for Plastic Material
Description:Insulator press for forming the bottom shell and threaded pinhole of multipart porcelain insulators (Thomas blue jean seam impression in bottom skirt)
Category:Press
Assigned to:The R. Thomas & Sons Co.

Patentee Information:

THOMAS, George W. East Liverpool, OH

Class and subclass information:

Class:425PLASTIC ARTICLE OR EARTHENWARE SHAPING OR TREATING: APPARATUS
Subclass:89WITH INTERPOSED NON-ADHERING WEB OR SHEET TYPE PARTING MEANS;
Class:425PLASTIC ARTICLE OR EARTHENWARE SHAPING OR TREATING: APPARATUS
Subclass:420PRESS FORMING APPARATUS HAVING OPPOSED PRESS MEMBERS Male shaping member and female mold Including provision to remove entrained gas;

Known specimens:

None known

Drawings:

Drawing page 1

Page 1

Drawing page 2

Page 2