Granted Patent
Utility
US 4,602,796 · App. 06/626,442
Well conduit joint sealing system
Inventor:
John R. Setterberg, Jr.
Patented Case
View Patent ↗
Granted: Jul 29, 1986
Filed: Jun 29, 1984
Inventor
John R. Setterberg, Jr.
Assignee (at issue)
Otis Engineering Corporation
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.