Granted Patent
Utility
US 4,516,967 · App. 06/517,050
Wet-dry compartmental syringe
Inventor:
Rudolph J. Kopfer
Patented Case
View Patent ↗
Granted: May 14, 1985
Filed: Jul 27, 1983
Inventor
Rudolph J. Kopfer
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.