Granted Patent
Utility
US 4,584,998 · App. 06/301,202
Multi-purpose tracheal tube
Inventor:
Thomas W. McGrail
Patented Case
View Patent ↗
Granted: Apr 29, 1986
Filed: Sep 11, 1981
Inventor
Thomas W. McGrail
Assignee (at issue)
MALLINCKRODT LLC
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.