Granted Patent
Utility
US 5,339,808 · App. 07/878,492
Endotracheal-esophageal intubation devices
Inventor:
T. Anthony Don Michael
Patented Case
View Patent ↗
Granted: Aug 23, 1994
Filed: May 5, 1992
Inventor
T. Anthony Don Michael
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.