Granted Patent
Utility
US 4,977,894 · App. 07/334,435
Laryngo-tracheal analgesia endotracheal tube
Inventor:
Gerald G. Davies
Patented Case
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Granted: Dec 18, 1990
Filed: Apr 7, 1989
Inventor
Gerald G. Davies
Assignee (at issue)
Sheridan Catheter Corp.
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.