Granted Patent
Utility
US 5,150,520 · App. 07/657,422
Heat exchanger and method of assembly thereof
Inventor:
Joseph F. DeRisi
Patented Case
View Patent ↗
Granted: Sep 29, 1992
Filed: Feb 19, 1991
Inventor
Joseph F. DeRisi
Assignee (at issue)
The Allen 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.