Granted Patent
Utility
US 4,495,800 · App. 06/441,855
Method for determining optimum concentration of hydration inhibitor for clays in drilling fluids
Inventor:
Roy D. Wilcox
Patented Case
View Patent ↗
Granted: Jan 29, 1985
Filed: Nov 15, 1982
Inventor
Roy D. Wilcox
Assignee (at issue)
NL Industries, 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.