Fluid dispenser

Claim 1

A FLUID DISPENSER OF THE CHARACTER DISCLOSED COMPRISING A RESILIENT WALLED RECEPTACLE FOR CONTAINING A QUANTITY OF LIQUID, AN OPENING IN SAID RECEPTACLE, A HOUSING HAVING THEREON A FLANGE FOR BEING RECEIVED WITHIN SAID OPENING FOR CLOSING THE LATTER AND INCLUDING A SMOOTH INNER FACE PORTION, MEANS FORMING AN AIR RETURN PASSAGE INTO SAID RECEPTACLE, MEANS FORMING AT LEAST ONE AIR RETURN PORT THROUGH SAID HOUSING WITH SAID PORT FORMING A PORT OF SAID AIR RETURN PASSAGE, A PLUG MEMBER DISPOSES IN SAID HOUSING AND INCLUDING A FLEXIBLE FLANGE PORTION YIELDABLY BEARING AGAINST THE SAID SMOOTH INNER FACE OF SAID HOUSING FLANGE IN A MANNER TO CLOSE SAID AIR RETURN PASSAGE, SAID FLEXIBLE FLANGE BEING OPERABLE UPON A PREDETERMINED DROP IN PRESURE WITHIN SAID RECEPTACLE TO MOVE FROM SAID HOUSING FLANGE TO OPEN SAID AIR RETURN PASSAGE, MEANS FORMING A DISCHARGE PORT IN SAID HOUSING, MEANS FORMING AN AIR DISCHARGE PASSAGE TO SAID DISCHARGE PORT, VALVE MEANS NORMALLY CLOSING SAAID AIR DISCHARGE PASSAGE AND OPERATIVE UPON A PREDETERMINED INCREASE IN PRESSURE WITHIN SAID RECEPTACLE TO OPEN AND PASS AIR TO SAID DISCHARGE PORT, MEANS FORMING A LIQUID DISCHARGE PASSAGE TO SAID DISCHARGE PORT, VALVE MEANS NORMALLY CLOSING SAID LIQUID DISCHARGE PASSAGE, SAID LAST NAMED VALVE MEANS BEING OPERABLE UPON A PREDETERMINED INCREASE IN PRESSURE WITHIN SAID RECEPTACLE TO OPEN AND PASS LIQUID TO SAID DISCHARGE PORT.