Granted Patent
Utility
US 4,994,029 · App. 07/405,989
Syringe mixer and injector device
Inventor:
John Rohrbough
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Sep 12, 1989
Inventor
John Rohrbough
Assignee (at issue)
David Bull Laboratories Pty. Ltd.
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.