Granted Patent
Utility
US 4,738,248 · App. 06/887,605
Surgical retractors
Inventor:
Charles D. Ray
Patented Case
View Patent ↗
Granted: Apr 19, 1988
Filed: Jul 17, 1986
Inventor
Charles D. Ray
Assignee (at issue)
CeDaR Development Corp.
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.