Granted Patent
Utility
US 6,825,152 · App. 09/805,316
Method for creating dense drilling fluid additive and composition therefor
Inventor:
Ban D. Green
Patented Case
View Patent ↗
Granted: Nov 30, 2004
Filed: Mar 13, 2001
Inventor
Ban D. Green
Assignee (at issue)
Grinding & Sizing Company LLC
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.