Granted Patent
Utility
US 5,810,998 · App. 08/869,409
Process for improving the brightness of fine-grained kaolin clays
Inventors:
Lee Ann Arrington-Webb, Chris B. Maxwell, Prakash B. Malla, Amy C. Semratedu
Patented Case
View Patent ↗
Granted: Sep 22, 1998
Filed: Jun 5, 1997
Inventors
Lee Ann Arrington-Webb
Chris B. Maxwell
Prakash B. Malla
Amy C. Semratedu
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.