Granted Patent
Utility
US 4,753,460 · App. 06/727,860
Tubular connection having two thread sets with multiple interengaging characteristics
Inventor:
Lawrence Y. Tung
Patented Case
View Patent ↗
Granted: Jun 28, 1988
Filed: Apr 26, 1985
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.