Granted Patent
Utility
US 5,591,699 · App. 08/360,558
Particle transport fluids thickened with acetylate free xanthan heteropolysaccharide biopolymer plus guar gum
Inventor:
Richard M. Hodge
Patented Case
View Patent ↗
Granted: Jan 7, 1997
Filed: Dec 21, 1994
Inventor
Richard M. Hodge
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.