Granted Patent
Utility
US 6,615,843 · App. 10/085,806
Tobacco smoke filter and relative composition made of antioxidant and mineral substances
Inventor:
Ivo Pera
Patented Case
View Patent ↗
Granted: Sep 9, 2003
Filed: Feb 28, 2002
Inventor
Ivo Pera
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.