Granted Patent
Utility
US 5,473,787 · App. 08/262,855
Method and apparatus for cleaning tubes of heat exchangers
Inventor:
James F. Echols
Patented Case
View Patent ↗
Granted: Dec 12, 1995
Filed: Jun 21, 1994
Inventor
James F. Echols
Assignee (at issue)
Betz Laboratories, 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.