Granted Patent
Utility
US 4,072,148 · App. 05/756,448
Multistage mixing valve for a medical respirator
Inventors:
Ramon J. Munson, Claude C. Hurd, James Weigl
Patented Case
View Patent ↗
Granted: Feb 7, 1978
Filed: Jan 3, 1977
Inventors
Ramon J. Munson
Claude C. Hurd
James Weigl
Assignee (at issue)
Bourns, 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.