Granted Patent
Utility
US 4,718,484 · App. 06/655,044
Heat exchanger unit
Inventor:
Russell W. Hoeffken
Patented Case
View Patent ↗
Granted: Jan 12, 1988
Filed: Sep 26, 1984
Inventor
Russell W. Hoeffken
Assignee (at issue)
Snyder General Corporation
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.