Granted Patent
Utility
US 4,459,214 · App. 06/330,242
Viscous heavy brines
Inventors:
Roy F. House, Lonnie D. Hoover
Patented Case
View Patent ↗
Granted: Jul 10, 1984
Filed: Dec 14, 1981
Inventors
Roy F. House
Lonnie D. Hoover
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.