Granted Patent
Utility
US 4,813,926 · App. 07/188,695
Medical suction device with air vent and fixed restrictor
Inventor:
Michael J. Kerwin
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: May 2, 1988
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.