Granted Patent
Utility
US 5,657,722 · App. 08/593,993
System for maintaining engine oil at a desired temperature
Inventor:
Thomas J. Hollis
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Jan 30, 1996
Inventor
Thomas J. Hollis
Assignee (at issue)
Thomas J. Hollis
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.