Granted Patent
Utility
US 4,984,631 · App. 07/367,931
System and plug for plugging a conduit
Inventor:
David L. Reesing
Patented Case
View Patent ↗
Granted: Jan 15, 1991
Filed: Jun 19, 1989
Inventor
David L. Reesing
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.