Granted Patent
Utility
US 4,944,538 · App. 07/320,476
Threaded pipe joint having improved seal ring entrapment
Inventor:
Shannon R. Read
Patented Case
View Patent ↗
Granted: Jul 31, 1990
Filed: Mar 8, 1989
Inventor
Shannon R. Read
Assignee (at issue)
Baroid Technology, 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.