Granted Patent
Utility
US 4,248,217 · App. 06/089,320
Inhalation heater control
Inventor:
A. Glen Brisson
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Oct 30, 1979
Inventor
A. Glen Brisson
Assignee (at issue)
Respiratory Care, 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.