Granted Patent
Utility
US 5,537,994 · App. 08/253,949
Combination face mask and dental device for improved breathing during sleep
Inventor:
W. Keith Thornton
Patented Case
View Patent ↗
Granted: Jul 23, 1996
Filed: Jun 3, 1994
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.