Granted Patent
Utility
US 4,846,169 · App. 07/020,515
Device for controlling respirating gas in an anaesthesia or respiratory apparatus
Inventors:
Lothar Kleinschmidt, Carl F. Wallroth, Michael Waschmann
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Mar 2, 1987
Inventors
Lothar Kleinschmidt
Carl F. Wallroth
Michael Waschmann
Assignee (at issue)
DRAGERWERK AKTIEGESELLSCHAFT
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.