Granted Patent
Utility
US 4,889,635 · App. 07/042,878
Method and apparatus for controlling the quantities of liquid circulating in the dialysis liquid circuit of an artificial kidney
Inventor:
Jacques Chevallet
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Apr 24, 1987
Inventor
Jacques Chevallet
Assignee (at issue)
Hospal Industrie
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.