Granted Patent
Utility
US 5,318,580 · App. 07/752,867
Retractable trocar
Inventor:
Charles Gresl
Patented Case
View Patent ↗
Granted: Jun 7, 1994
Filed: Aug 30, 1991
Inventor
Charles Gresl
Assignee (at issue)
Origin Medsystems, 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.