Granted Patent
Utility
US 6,668,830 · App. 09/443,504
Low noise exhalation port for a respiratory mask
Inventors:
Gary L. Hansen, Christine G. Kronich, Clifford Jue
Patented Case
View Patent ↗
Granted: Dec 30, 2003
Filed: Nov 19, 1999
Inventors
Gary L. Hansen
Christine G. Kronich
Clifford Jue
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.