Granted Patent
Utility
US 5,645,821 · App. 08/540,249
Alkaline oral hygiene composition
Inventor:
Barry M. Libin
Patented Case
View Patent ↗
Granted: Jul 8, 1997
Filed: Oct 6, 1995
Inventor
Barry M. Libin
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.