Granted Patent
Utility
US 6,811,600 · App. 10/350,370
Chemically bulked kaolin clay pigment compatible with calcium carbonate and manufacture thereof
Inventors:
Sharad Mathur, Richard Berube
Patented Case
View Patent ↗
Granted: Nov 2, 2004
Filed: Jan 23, 2003
Inventors
Sharad Mathur
Richard Berube
Assignee (at issue)
Engelhard Corporation
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.