Granted Patent
Utility
US 6,571,794 · App. 09/691,154
Multi-lumen hose for respirators
Inventor:
Gary L. Hansen
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: Oct 19, 2000
Inventor
Gary L. Hansen
Assignee (at issue)
MALLINCKRODT LLC
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.