Granted Patent
Utility
US 4,445,261 · App. 06/173,142
Method for installing tubes in a tube sheet
Inventor:
John W. Kelly
Patented Case
View Patent ↗
Granted: May 1, 1984
Filed: Jul 28, 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.