Granted Patent
Utility
US 5,558,171 · App. 08/232,386
Well drilling process and clay stabilizing agent
Inventors:
Raymond E. McGlothlin, Frank B. Woodworth
Patented Case
View Patent ↗
Granted: Sep 24, 1996
Filed: Apr 25, 1994
Inventors
Raymond E. McGlothlin
Frank B. Woodworth
Assignee (at issue)
M-I Drilling Fluids L.L.C.
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.