Granted Patent
Utility
US 4,159,722 · App. 05/782,221
Pressure regulator for endotracheal tube cuff or the like
Inventor:
Clarence L. Walker
Patented Case
View Patent ↗
Granted: Jul 3, 1979
Filed: Mar 28, 1977
Inventor
Clarence L. Walker
Assignee (at issue)
Sherwood Medical Industries Inc.
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.