Granted Patent
Utility
US 5,040,600 · App. 07/540,712
Geothermal wellhead repair unit
Inventors:
Thomas F. Bailey, James N. Strickland
Patented Case
View Patent ↗
Granted: Aug 20, 1991
Filed: Jun 20, 1990
Inventors
Thomas F. Bailey
James N. Strickland
Assignee (at issue)
Drilex Systems, 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.