Granted Patent
Utility
US 4,602,500 · App. 06/771,029
Apparatus for leakage testing of tubes and joints
Inventor:
John W. Kelly
Patented Case
View Patent ↗
Granted: Jul 29, 1986
Filed: Aug 30, 1985
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.