Granted Patent
Utility
US 4,275,581 · App. 05/918,630
Method for increasing the fin density of a heat exchanger
Inventor:
Kenneth J. Miller
Patented Case
View Patent ↗
Granted: Jun 30, 1981
Filed: Jun 23, 1978
Inventor
Kenneth J. Miller
Assignee (at issue)
Caterpillar Tractor Co.
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.