Granted Patent
Utility
US 5,843,872 · App. 08/974,405
Drilling fluid system and related methods
Inventors:
Jerry Rayborn, John J. Rayborn
Patented Case
View Patent ↗
Granted: Dec 1, 1998
Filed: Nov 19, 1997
Inventors
Jerry Rayborn
John J. Rayborn
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.