Granted Patent
Utility
US 5,558,154 · App. 07/983,731
Captive flow donut oil cooler
Inventor:
Thomas Lefeber
Patented Case
View Patent ↗
Granted: Sep 24, 1996
Filed: Dec 1, 1992
Inventor
Thomas Lefeber
Assignee (at issue)
MODINE MANUFACTURING COMPANY
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.