Granted Patent
Utility
US 4,617,015 · App. 06/640,074
Visual pressure indicator for endotracheal cuff
Inventor:
Carl L. Foltz
Patented Case
View Patent ↗
Granted: Oct 14, 1986
Filed: Aug 10, 1984
Inventor
Carl L. Foltz
Assignee (at issue)
Halkey-Roberts Corporation
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.