Granted Patent
Utility
US 5,590,716 · App. 08/431,274
Method of inhibiting downhole corrosion of metal surfaces
Inventor:
William D. Mansfield
Patented Case
View Patent ↗
Granted: Jan 7, 1997
Filed: Apr 28, 1995
Inventor
William D. Mansfield
Assignee (at issue)
Drew Chemical Corporation
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.