Granted Patent
Utility
US 6,158,785 · App. 09/130,249
Multi-start wedge thread for tubular connection
Inventors:
Bernard F. Beaulier, David Llewellyn Mallis
Patented Case
View Patent ↗
Granted: Dec 12, 2000
Filed: Aug 6, 1998
Inventors
Bernard F. Beaulier
David Llewellyn Mallis
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.