Granted Patent
Utility
US 5,423,743 · App. 08/123,327
Cannula position detection
Inventor:
Robert D. Butterfield
Patented Case
View Patent ↗
Granted: Jun 13, 1995
Filed: Sep 17, 1993
Inventor
Robert D. Butterfield
Assignee (at issue)
IVAC Corporation
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.