Granted Patent
Utility
US 4,994,045 · App. 07/511,667
Split sleeve safety syringe
Inventor:
Alan B. Ranford
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Apr 20, 1990
Inventor
Alan B. Ranford
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.