Granted Patent
Utility
US 4,923,451 · App. 07/268,310
Suction control chamber having a filter for use in chest drainage devices
Inventor:
Michael McCormick
Patented Case
View Patent ↗
Granted: May 8, 1990
Filed: Nov 7, 1988
Inventor
Michael McCormick
Assignee (at issue)
Sherwood Medical Company
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.