Granted Patent
Utility
US 4,453,595 · App. 06/415,537
Method of measuring fracture pressure in underground formations
Inventors:
Peter L. Lagus, Edward W. Peterson
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Sep 7, 1982
Inventors
Peter L. Lagus
Edward W. Peterson
Assignee (at issue)
Maxwell Laboratories, Inc.
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.