Granted Patent
Utility
US 4,430,991 · App. 06/318,654
Surgical retractor stay device and tube connector
Inventor:
W. Dale Darnell
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Nov 5, 1981
Inventor
W. Dale Darnell
Assignee (at issue)
Humboldt Products 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.