Granted Patent
Utility
US 4,894,182 · App. 07/109,393
Organophilic clay gellant and processes for preparing organophilic clay gellants
Inventors:
Charles A. Cody, Steven J. Kemnetz
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: Oct 19, 1987
Inventors
Charles A. Cody
Steven J. Kemnetz
Assignee (at issue)
NL Chemicals, 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.