Apparatus for transferring cryogenic liquids

Claim 1

A STORAGE VESSEL FOR CRYOGENIC FLUID COMPRISING A RIGID INNER CONTAINER ENCLOSED BY A RIGID OUTER CONTAINER; SAID RIGID INNER CONTAINER BEIENG SPACED FROM SAID OUTER CONTAINER TO PROVIDE A GAS TIGHT CHAMBER SURROUNDING SAID INNER CONTAINER; CONDUIT MEANS PROVIDING COMMUNICATION WITH SAID CHAMBER AND PERMITTING INDUCTION OF A VACUUM IN SAID CHAMBER; AN INLET AND AN OUTLET TRAVERSING SAID CHAMBER; A BLADDER DISPOSED IN SAID INNER CONTAINER AND HAVING A SIMILAR CONFIGURATION AND DIMENSION TO ENABLE THE BLADDER TO BE SUBSANTIALLY CONTIGUOUS WITH THE INSIDE OF SAID INNER CONTAINER DURING THE STORAGE OF CRYOGENIC FLUID; SAID BLADDER HAVING AN OPEN NECK PORTION SECURED TO THE INNER CONTAINER BY AN ELLIPTICAL SEALING RING CONTIGUOUS TO THE INSIDE OF SAID BLADDER, A RING MEMBER DISPOSED BETWEEN SAID BLADDER AND INNER CONTAINER, A MOUNTING FLANGE ATTACHED TO THE OUTSIDE OF SAID INNER CONTAINER, AND A HEAD BOLTINGLY ATTACHED TO THE SAID ELLIPTICAL SEALING RING, SAID RING MEMBER AND SAID MOUNTING FLANGE; SAID NECK PORTION COMMUNICATING WITH SAID INLET AND OUTLET; A GUARD TERMINATING IN A SMOOTHLY ROUNDED PORTION DIS-