Granted Patent
Utility
US 4,787,994 · App. 07/179,921
Method for preparation of hydrocarbon fracturing fluids, fluids prepared thereby, and methods related thereto
Inventors:
Michael A. Thorne, Gary A. Scherubel
Patented Case
View Patent ↗
Granted: Nov 29, 1988
Filed: Apr 11, 1988
Inventors
Michael A. Thorne
Gary A. Scherubel
Assignee (at issue)
Petrolite Corporation
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.