Filter attachment for a pressurized breathing apparatus

Claim 1

PORTABLE BREATHING APPARATUS COMPRISING, IN COMBINATION, A FACE MASK, AN EXHALATION VALVE CONNECTED TO SAID MASK, A FILTER TUBULARLY CONNECTED TO SAID MASK FOR SUPPLYING FILTERED AMBIENT AIR TO SAID MASK, A CONTAINER OF COMPRESSED BREATHING FLUID, A DEMAND REGULATOR OF THE POSITIVE PRESSURE TYPE TUBULARLY CONNECTED TO SAID CONTAINER AND TO SAID MASK FOR SUPPLYING BREATHING FLUID TO SAID MASK FROM SAID CONTAINER ON DEMAND, AND A CHECK VALVE IN THE TUBULAR CONNECTION BETWEEN SAID FILTER AND SAID MASK PREVENTING THE ESCAPED OF BREATHING FLUID FROM SAID CONTAINER THROUGH SAID FILTER, SAID FILTER, SAID CONTAINER AND SAID REGULATOR BEING ADAPTED TO BE CARRIED BY THE USER, WHEREIN THE TUBULAR CONNECTIONS BETWEEN SAID FILTER AND SAID MASK AND BETWEEN SAID REGULATOR AND SAID MASK INCLUDE A T FITTING, MEANS DETACHABLY CONNECTING SAID FITTING TO SAID REGULATOR, A FIRST HOSE INTERCONNECTING SAID FILTER AND SAID FITTING, A SECOND HOSE INTERCONNECTING SAID MASK AND SAID FITTING, AND MEANS DETACHABLY CONNECTING SAID SECOND HOSE TO SAID FITTING BOTH SAID MEANS BEING INTERCHARGEABLE WHEREBY SAID SECOND HOSE CAN BE DETACHED FROM SAID FITTING AND ATTACHED TO SAID REGULATOR UPON DETACHMENT OF SAID FITTING FROM SAID REGULATOR.