Oxygen conservation system for commercial aircraft

Abstract From the Canadian patent

An emergency oxygen supply system for delivering oxygen to passengers in an aircraft in the event of a loss of cabin pressure comprises a source of oxygen for supplying a plurality of passengers and a reservoir bag for each passenger configured for accumulating a preselected volume of oxygen flowing from the oxygen source. A face mask for each passenger is configured to cause each passenger to inhale the accumulated volume prior to inhaling exclusively cabin air wherein the preselected volume of oxygen is accumulated for inhalation during each respiratory cycle. Operation of the system serves to conserve oxygen supplied to the passengers.