Granted Patent
Utility
US 5,328,461 · App. 07/876,041
Blow molded venous drip chamber for hemodialysis
Inventor:
David S. Utterberg
Patented Case
View Patent ↗
Granted: Jul 12, 1994
Filed: Apr 30, 1992
Inventor
David S. Utterberg
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.