Granted Patent
Utility
US 6,422,239 · App. 09/179,928
Laryngeal mask
Inventor:
Daniel J. Cook
Patented Case
View Patent ↗
Granted: Jul 23, 2002
Filed: Oct 27, 1998
Inventor
Daniel J. Cook
Assignee (at issue)
Daniel M. Cook
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.