Granted Patent
Utility
US 5,370,187 · App. 08/126,945
Over-pressured well fracturing method
Inventors:
Keith R. Ferguson, Joseph H. Schmidt
Patented Case
View Patent ↗
Granted: Dec 6, 1994
Filed: Sep 24, 1993
Inventors
Keith R. Ferguson
Joseph H. Schmidt
Assignee (at issue)
Atlantic Richfield 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.