Granted Patent
Utility
US 5,222,487 · App. 07/717,828
Hinged tracheostomy tube obturator
Inventors:
Ian Carr, Denis LaBombard
Patented Case
View Patent ↗
Granted: Jun 29, 1993
Filed: Jun 21, 1991
Inventors
Ian Carr
Denis LaBombard
Assignee (at issue)
Smiths Industries Medical Systems, 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.