Granted Patent
Utility
US 6,818,595 · App. 10/076,209
Drilling fluids containing an alkali metal formate
Inventors:
William J. Benton, John Toups, U. Roger Weems
Patented Case
View Patent ↗
Granted: Nov 16, 2004
Filed: Feb 14, 2002
Inventors
William J. Benton
John Toups
U. Roger Weems
Assignee (at issue)
Cabot Specialty Fluids, 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.