Granted Patent
Utility
US 4,254,826 · App. 06/074,554
Modular heat exchanger
Inventor:
Charles L. Adams
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Sep 11, 1979
Inventor
Charles L. Adams
Assignee (at issue)
PVI Industries, 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.