Granted Patent
Utility
US 5,000,163 · App. 07/374,911
Retraction device
Inventors:
Charles D. Ray, Duane J. Zythkovicz
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: Jul 3, 1989
Inventors
Charles D. Ray
Duane J. Zythkovicz
Assignee (at issue)
Surgical Dynamics, 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.