Granted Patent
Utility
US 4,517,112 · App. 06/348,641
Modified organophilic clay complexes, their preparation and non-aqueous systems containing them
Inventors:
Wilbur Mardis, Claude M. Finlayson
Patented Case
View Patent ↗
Granted: May 14, 1985
Filed: Feb 18, 1982
Inventors
Wilbur Mardis
Claude M. Finlayson
Assignee (at issue)
NL Industries, Inc.
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.