Granted Patent
Utility
US 5,149,690 · App. 07/783,368
Drilling fluid additive and method for inhibiting hydration
Inventors:
Arvind D. Patel, Henry C. McLaurine
Patented Case
View Patent ↗
Granted: Sep 22, 1992
Filed: Oct 28, 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.