Granted Patent
Utility
US 5,209,859 · App. 07/835,704
Inhibited acid system for acidizing wells
Inventors:
Dennis A. Williams, Phyllis K. Holifield, James R. Looney, Lee A. McDougall
Patented Case
View Patent ↗
Granted: May 11, 1993
Filed: Feb 12, 1992
Inventors
Dennis A. Williams
Phyllis K. Holifield
James R. Looney
Lee A. McDougall
Assignee (at issue)
Exxon Chemical Patents, 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.