Patent information:

Patent:Utility 589,256
Patented:August 31, 1897
Applied:May 16, 1896
Title:Process of Making Insulating Material
Description:Composition insulator made of paper pulp saturated with sulfur
Category:Composition
Assigned to: 

Patentee Information:

GRAY, John South Manchester, CT
CASE, Charles H. South Manchester, CT

Class and subclass information:

Class:264PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES
Subclass:136WITH PRINTING OR COATING OF WORKPIECE (OUT OF MOLD) Coating or impregnating workpiece before molding or shaping step Impregnation of batt, sheet, or filament;
Class:4BATHS, CLOSETS, SINKS, AND SPITTOONS
Subclass:237 
Class:264PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES
Subclass:DIG54Processes in making insulators;

Known specimens:

None known