Granted Patent
Utility
US 6,143,698 · App. 09/206,077
Method for removing filtercake
Inventors:
Joseph R. Murphey, Jeffrey McKennis, Keith W. Sharp
Patented Case
View Patent ↗
Granted: Nov 7, 2000
Filed: Dec 4, 1998
Inventors
Joseph R. Murphey
Jeffrey McKennis
Keith W. Sharp
Assignee (at issue)
TETRA Technologies, 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.