Granted Patent
Utility
US 5,484,397 · App. 08/155,993
Artificial kidney for frequent (daily) hemodialysis
Inventor:
Zbylut J. Twardowski
Patented Case
View Patent ↗
Granted: Jan 16, 1996
Filed: Nov 22, 1993
Inventor
Zbylut J. Twardowski
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.