Granted Patent
Utility
US 6,675,802 · App. 09/851,679
Device for improving breathing incorporating a detachable venting seal
Inventor:
W. Keith Thornton
Patented Case
View Patent ↗
Granted: Jan 13, 2004
Filed: May 8, 2001
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.