Granted Patent
Utility
US 4,795,200 · App. 07/168,544
Lengthened tubular pin member nose for improving sealing integrity and bearing forces
Inventor:
Lawrence Y. Tung
Patented Case
View Patent ↗
Granted: Jan 3, 1989
Filed: Mar 9, 1988
Inventor
Lawrence Y. Tung
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.