Granted Patent
Utility
US 4,434,846 · App. 06/251,382
Patterned heat exchanger fin
Inventor:
James W. B. Lu
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Apr 6, 1981
Inventor
James W. B. Lu
Assignee (at issue)
McQuay, 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.