Granted Patent
Utility
US 4,550,776 · App. 06/497,661
Inclined radially louvered fin heat exchanger
Inventor:
James W. B. Lu
Patented Case
View Patent ↗
Granted: Nov 5, 1985
Filed: May 24, 1983
Inventor
James W. B. Lu
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.