Granted Patent
Utility
US 4,528,104 · App. 06/409,491
Oil based packer fluids
Inventors:
Roy F. House, Forrest A. Scearce
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Aug 19, 1982
Inventors
Roy F. House
Forrest A. Scearce
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.