Granted Patent
Utility
US 5,176,631 · App. 07/509,689
Ultrasonic air-in-line detector for detecting entrained air in a medication infusion system
Inventor:
Paul A. Koenig
Patented Case
View Patent ↗
Granted: Jan 5, 1993
Filed: Apr 16, 1990
Inventor
Paul A. Koenig
Assignee (at issue)
Pacesetter Infusion, Ltd.
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.