Granted Patent
Utility
US 4,040,974 · App. 05/680,593
Synthesized gellants containing smectite-type clay and process for producing same
Inventors:
Alan C. Wright, Joseph Paul Rupert
Patented Case
View Patent ↗
Granted: Aug 9, 1977
Filed: Apr 26, 1976
Inventors
Alan C. Wright
Joseph Paul Rupert
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.