Granted Patent
Utility
US 4,606,365 · App. 06/751,309
Buoyant blood stop valve
Inventor:
George G. Siposs
Patented Case
View Patent ↗
Granted: Aug 19, 1986
Filed: Jul 2, 1985
Inventor
George G. Siposs
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.