Granted Patent
Utility
US 5,934,373 · App. 08/790,292
Apparatus and method for monitoring underground fracturing
Inventors:
Norman R. Warpinski, Terry D. Steinfort, Paul T. Branagan, Roy H. Wilmer
Patented Case
View Patent ↗
Granted: Aug 10, 1999
Filed: Jan 29, 1997
Inventors
Norman R. Warpinski
Terry D. Steinfort
Paul T. Branagan
Roy H. Wilmer
Assignee (at issue)
Gas Research Institute
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.