Granted Patent
Utility
US 3,977,894 · App. 05/615,105
Rheological agent for non-aqueous fluid systems
Inventors:
Robert W. White, Armando Franco
Patented Case
View Patent ↗
Granted: Aug 31, 1976
Filed: Sep 19, 1975
Inventors
Robert W. White
Armando Franco
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.