Granted Patent
Utility
US 6,364,015 · App. 09/368,759
Method of determining fracture closure pressures in hydraulicfracturing of subterranean formations
Inventor:
Eric Roberto Upchurch
Patented Case
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Granted: Apr 2, 2002
Filed: Aug 5, 1999
Inventor
Eric Roberto Upchurch
Assignee (at issue)
Phillips Petroleum 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.