Granted Patent
Utility
US 5,393,340 · App. 08/150,335
Metakaolin pigment with high brightness and low abrasion and manufacture thereof from soft kaolin clays
Inventors:
Richard A. Slepetys, M. Phillip Jameson
Patented Case
View Patent ↗
Granted: Feb 28, 1995
Filed: Nov 9, 1993
Inventors
Richard A. Slepetys
M. Phillip Jameson
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.