Granted Patent
Utility
US 4,671,544 · App. 06/787,662
Seal for threaded pipe connection
Inventor:
Donald J. Ortloff
Patented Case
View Patent ↗
Granted: Jun 9, 1987
Filed: Oct 15, 1985
Inventor
Donald J. Ortloff
Assignee (at issue)
Hydril Company
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.