Granted Patent
Utility
US 5,429,191 · App. 08/205,910
High-pressure well fracturing method using expansible fluid
Inventors:
Joseph H. Schmidt, Thomas K. Perkins, James C. Abel, Charles R. Eason, Jr.
Patented Case
View Patent ↗
Granted: Jul 4, 1995
Filed: Mar 3, 1994
Inventors
Joseph H. Schmidt
Thomas K. Perkins
James C. Abel
Charles R. Eason, Jr.
Assignees (at issue)
Atlantic Richfield Company
Dowell Schlumberger Incorporated
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.