Stoppers for vessels, especially for bottles with gaseous or sparkling liquids

Claim 1

A STOPPER FOR CLOSING A NECK OPENING IN A BOTTLE CONTAINING A CARBONATED LIQUID OR THE LIKE, THE COMBINATION COMPRISING A BODY MEMBER MADE ENTIRELY OF ELASTIC MATERIAL AND INCLUDING A HEAD PORTION AND A HOLLOW SHANK PORTION ADAPTED TO EXTEND INTO THE NECK OPENING, SAID HEAD PORTION BEING INTEGRAL WITH SAID BODY MEMBER AND BEING ADAPTED TO SEAT ON THE EXTERIOR OF THE BOTTLE NECK, SAID HOLLOW SHANK PORTION HAVING ONE END INTEGRAL WITH SAID BODY MEMBER AND SAID HEAD PORTION AND HAVING AN OPPOSITE END DEFINING AN OPENING ADAPTED TO COMMUNICATE WITH THE INTERIOR OF THE BOTTLE, A FLEXIBLE WALL DEFINING AN INTERMEDIATE PART OF SAID HOLLOW SHANK PORTION BETWEEN ITS SAID ENDS AND BEING ADAPTED TO RESILIENTLY ENGAGE THE INTERIOR OF THE BOTTLE NECK WHEREBY THE STOPPER IS SECURED THERETO, SAID FLEXIBLE WALL BEING ADAPTED TO FLEX AGAINST THE INTERIOR OF THE BOTTLE NECK IN RESPONSE TO PRESSURE IN THE BOTTLE WHEREBY THE STOPPER SEALS THE NECK OPENING IN THE BOTTLE, PORT MEANS IN SAID HEAD PORTION FOR ESTABLISHING COMMUNICATION WITH SAID HOLLOW SHANK PORTION, AND ELASTIC VALVE MEANS INTEGRALLY FORMED ON SAID HEAD PORTION TO CONTROL SAID PORT MEANS.