Granted Patent
Utility
US 6,102,038 · App. 09/080,327
Exhalation valve for mechanical ventilator
Inventor:
Douglas F. DeVries
Patented Case
View Patent ↗
Granted: Aug 15, 2000
Filed: May 15, 1998
Inventor
Douglas F. DeVries
Assignee (at issue)
Pulmonetic 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.