Granted Patent
Utility
US 4,487,434 · App. 06/352,588
Union-type coupling for marine drilling riser pipe
Inventor:
Joseph R. Roche
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: Feb 26, 1982
Inventor
Joseph R. Roche
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.