Granted Patent
Utility
US 4,747,844 · App. 06/909,779
Chest drainage apparatus
Inventor:
Donald P. Elliott
Patented Case
View Patent ↗
Granted: May 31, 1988
Filed: Sep 19, 1986
Inventor
Donald P. Elliott
Assignee (at issue)
C. R. Bard, 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.