Granted Patent
Utility
US 4,725,266 · App. 06/884,190
Left ventricle vacuum control and pressure relief valve
Inventor:
George G. Siposs
Patented Case
View Patent ↗
Granted: Feb 16, 1988
Filed: Jul 10, 1986
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.