Patent information:

Patent:Utility 1,723,174
Patented:August 6, 1929
Applied:March 26, 1927
Title:Use of Dumortierite
Description:Porcelain composition use the mineral dumortierite which allows firing at a lower temperature
Assigned to:Champion Porcelain Co.

Patentee Information:

JEFFERY, Joseph A. Detroit, MI
RIDDLE, Frank H. Detroit, MI

Class and subclass information:

Subclass:143CERAMIC COMPOSITIONS Clay containing (e.g., porcelain, earthenware, etc.) And flint or feldspar;

Known specimens:

None known