Granted Patent
Utility
US 4,414,739 · App. 06/218,431
Apparatus for hydraulically forming joints between tubes and tube sheets
Inventor:
John W. Kelly
Patented Case
View Patent ↗
Granted: Nov 15, 1983
Filed: Dec 19, 1980
Inventor
John W. Kelly
Assignee (at issue)
Haskel, 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.