Granted Patent
Utility
US 5,655,506 · App. 08/533,471
System for preheating intake air for an internal combustion engine
Inventor:
Thomas J. Hollis
Patented Case
View Patent ↗
Granted: Aug 12, 1997
Filed: Sep 25, 1995
Inventor
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.