Granted Patent
Utility
US 5,503,221 · App. 08/391,639
Discharge system for combustion gases
Inventor:
Philip R. Koudijs
Patented Case
View Patent ↗
Granted: Apr 2, 1996
Filed: Feb 21, 1995
Inventor
Philip R. Koudijs
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.