Granted Patent
Utility
US 5,134,118 · App. 07/659,826
Aqueous based drilling fluid
Inventors:
Arvind D. Patel, Henry C. McLaurine
Patented Case
View Patent ↗
Granted: Jul 28, 1992
Filed: Feb 22, 1991
Inventors
Arvind D. Patel
Henry C. McLaurine
Assignee (at issue)
M-I Drilling Fluids
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.