Granted Patent
Utility
US 4,595,513 · App. 06/639,752
Oil base well treating fluids thickened by block copolymers
Inventors:
Lee N. Morgenthaler, Wayne J. Mikols
Patented Case
View Patent ↗
Granted: Jun 17, 1986
Filed: Aug 10, 1984
Inventors
Lee N. Morgenthaler
Wayne J. Mikols
Assignee (at issue)
SHELL OIL COMPANY
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.