Granted Patent
Utility
US 4,434,076 · App. 06/313,034
Clay cation complexes and their use to increase viscosity of liquid organic systems
Inventors:
Wilbur Mardis, Claude M. Finlayson
Patented Case
View Patent ↗
Granted: Feb 28, 1984
Filed: Oct 19, 1981
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.