Granted Patent
Utility
US 4,633,887 · App. 06/637,464
Anti-reflux drain tube and drainage meter combination
Inventors:
Christopher J. Edwards, Robert George, Paul Sherlock
Patented Case
View Patent ↗
Granted: Jan 6, 1987
Filed: Aug 3, 1984
Inventors
Christopher J. Edwards
Robert George
Paul Sherlock
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.