Granted Patent
Utility
US 4,240,434 · App. 05/949,734
Peritoneo-venous shunt
Inventor:
John B. Newkirk
Patented Case
View Patent ↗
Granted: Dec 23, 1980
Filed: Oct 10, 1978
Inventor
John B. Newkirk
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.