Granted Patent
Utility
US 5,183,464 · App. 07/702,642
Radially expandable dilator
Inventors:
William Dubrul, Cecily M. Hillsman
Patented Case
View Patent ↗
Granted: Feb 2, 1993
Filed: May 17, 1991
Inventors
William Dubrul
Cecily M. Hillsman
Assignee (at issue)
Interventional Thermodynamics, 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.