Granted Patent
Utility
US 5,129,446 · App. 07/740,734
Air/liquid heat exchanger
Inventor:
Henry Earl Beamer
Patented Case
View Patent ↗
Granted: Jul 14, 1992
Filed: Aug 6, 1991
Inventor
Henry Earl Beamer
Assignee (at issue)
General Motors LLC
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.