Granted Patent
Utility
US 4,374,595 · App. 06/159,754
Metal to metal sealed joint for tubing string
Inventor:
Bruce J. Watkins
Patented Case
View Patent ↗
Granted: Feb 22, 1983
Filed: Jun 16, 1980
Inventor
Bruce J. Watkins
Assignee (at issue)
Hughes Tool Company LLC
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.