Granted Patent
Utility
US 4,490,135 · App. 06/423,380
Single needle alternating blood flow system
Inventor:
Vernon H. Troutner
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Sep 24, 1982
Inventor
Vernon H. Troutner
Assignee (at issue)
Extracorporeal Medical Specialties, Inc.
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.