Granted Patent
Utility
US 6,379,452 · App. 09/533,508
Calcined kaolin clay pigments having improved color and process for the manufacture thereof
Inventors:
Chris B. Maxwell, Zhenzhong Zhang, Haydn Murray
Patented Case
View Patent ↗
Granted: Apr 30, 2002
Filed: Mar 23, 2000
Inventors
Chris B. Maxwell
Zhenzhong Zhang
Haydn Murray
Assignee (at issue)
Thiele Kaolin Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.