Granted Patent
Utility
US 5,344,397 · App. 07/903,587
Cholangiogram catheter
Inventors:
Malcolm Heaven, Hira V. Thapliyal
Patented Case
View Patent ↗
Granted: Sep 6, 1994
Filed: Jun 26, 1992
Inventors
Malcolm Heaven
Hira V. Thapliyal
Assignee (at issue)
Advanced Surgical, 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.