Granted Patent
Utility
US 4,802,474 · App. 07/093,311
Protective cover for tracheotomy tube
Inventor:
Katherine K. Beevers
Patented Case
View Patent ↗
Granted: Feb 7, 1989
Filed: Sep 4, 1987
Inventor
Katherine K. Beevers
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.