Granted Patent
Utility
US 5,755,219 · App. 08/645,673
Device for improving breathing
Inventor:
W. Keith Thornton
Patented Case
View Patent ↗
Granted: May 26, 1998
Filed: May 14, 1996
Inventor
W. Keith Thornton
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.