Granted Patent
Utility
US 5,257,648 · App. 07/864,304
Pressure testing of tubular fitting installed to a ported wall
Inventor:
Robert A. Oropallo
Patented Case
View Patent ↗
Granted: Nov 2, 1993
Filed: Apr 6, 1992
Inventor
Robert A. Oropallo
Assignee (at issue)
American Brass & Aluminum Foundry Company, Inc.
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.