Granted Patent
Utility
US 4,769,019 · App. 07/014,435
Drainage apparatus
Inventor:
Michael J. Kerwin
Patented Case
View Patent ↗
Granted: Sep 6, 1988
Filed: Feb 13, 1987
Inventor
Michael J. Kerwin
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.