Granted Patent
Utility
US 5,830,818 · App. 08/839,036
Process for the microwave beneficiation of discolored kaolin clay materials
Inventors:
Jeffrey C. Bruns, Jessica E. Kogel, Susan A. Lewis
Patented Case
View Patent ↗
Granted: Nov 3, 1998
Filed: Apr 23, 1997
Inventors
Jeffrey C. Bruns
Jessica E. Kogel
Susan A. Lewis
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.