Granted Patent
Utility
US 4,376,707 · App. 06/243,968
Process for the removal of urea from blood wash fluids and blood
Inventor:
Hans D. Lehmann
Patented Case
View Patent ↗
Granted: Mar 15, 1983
Filed: May 21, 1979
Inventor
Hans D. Lehmann
Assignee (at issue)
Gambro Dialysatoren GmbH
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.