Bottle of plastic material and closure member therefor

Claim 1

A CLOSURE MEMBER FOR LIQUID CONTAINERS OF PLASTIC MATERIAL OF LOW RESISTANCE TO PRESSURE HAVING A THIN-WALLED BODY PORTION AND A NECK PORTION, SAID CLOSURE MEMBER BEING DESIGNED FOR LIQUID-TIGHT ENGAGEMENT WITH THE NECK PORTION OF SAID CONTAINER AND CONSISTING OF A STRUCTURE WHICH IS A STOPPER-LIKE BODY HAVING TWO CAVITIES, ONE CAVITY HAVING A CAPILLARY OUTLET TO THE AIR, THE OTHER CAVITY HAVING A CAPILLARY CONNECTION TO THE INTERIOR, A SEALING LIQUID FOR PARTLY FILLING SAID SECOND CAVITY, SAID CAPILLARY IN SAID SECOND CAVITYU HAVING ONE END ABOVE SAID SEALING LIQUID, AND A TUBE FOR CONNECTING SAID TWO CAVITIES, SAID CONNECTING TUBE EXTENDING INTO SAID SECOND CAVITY TOWARD A WALL THEREOF, AND TOWARD THE LEVEL OF THE SEALING LIQUID WHEREBY UPON PRESSURE RISING WITHIN THE INTERIOR OF THE BOTTLE GAS WILL BE EXPELLED THROUGH SAID LIQUID AND UPON DROP OF PRESSURE THE SEALING LIQUID IN THE SECOND CAVITY WILL RECEDE FROM THE CONNECTING TUBE AND PREVENT AIR FROM OUTSIDE FROM ENTERING THE INTERIOR OF THE BOTTLE.