Oxygen supply system

Claim 1

A LIQUID OXYGEN CONVERTER COMPRISING: A CONTAINER FOR STORING LIQUID OXYGEN; AN EVAPORATING COIL FOR CONVERTING LIUQID OXYGEN INTO GASEOUS OXYGEN; VALVE STRUCTURE COMPRISING A HOUSING HAVING A CHAMBER THEREIN AND PROVIDED WITH A PAIR OF INLET PORTS, AN OUTLET PORT, A VENT PORT, FIRST AND SECOND VALVE SEATS, AND A VALVE ASSEMBLY, THE LATTER COMPRISING A FIRST VALVE MEMBER FOR SAID FIRST VALVE SEAT DISPOSED IN SAID CHAMBER FOR COMMUNICATING SAID INLET PORTS BY DISENGAGEMENT FROM SAID FIRST VALVE SEAT ONLY WHEN THE PRESSURE IN SAID CHAMBER IS BELOW A FIRST PREDETERMINED VALUE, A SECOND VALVE MEMBER FOR SAID SECOND VALVE SEAT DISPOSED IN SAID CHAMBER FOR COMMUNICATING SAID INLET PORTS WITH SAID OUTLET PORT ONLY WHEN THE PRESSURE IN SAID CHAMBER IS ABOVE A SECOND, LOWER PREDETERMINED VALUE, AND MEANS DISPOSED IN SAID CHAMBER AND RESPONSIVE TO THE CHAMBER PRESSURE FOR ACTUATING SAID FIRST AND SECOND VALVE MEMBERS, SAID MEANS INCLUDING PRESSURE RESPONSIVE ALVE MEANS FOR COMMUNICATING SAID CHAMBER WITH SAID VENT PORT ONLY WHEN THE CHAMBER PRESSURE REACHES A THIRD, HIGHER PREDETERMINED VALUE; AND CONDUIT MEANS CONNECTING SAID EVAPORATING COIL WITH SAID CONTAINER AND ONE OF SAID INLET PORTS AND CONNECTING SAID CONTAINER WITH THE OTHER OF SAID INLET PORTS, WHEREBY LIUQID OXYGEN IS ALLOWED TO FLOW FROM SAID CONTAINER TO SAID COIL FOR CONVERSION TO GASEOUS OXYGEN WHEN THE CHAMBER PRESSURE IS BELOW SAID FIRST PREDETERMINED VALUE AND WHERBY GASEOUS OXYGEN MAY BE OBTAINED FROM THE OUTLET PORT WHEN THE CHAMBER PRESSURE IS ABOVE SAID SECOND PREDETERMINED VALUE.