Abstract: A dewar for storing a cryogenic fluid includes an inner vessel, an outer vessel, and a one-piece neck tube. The outer vessel includes an outer upper jacket and an outer lower jacket configured to be joined and define an interior chamber. The inner vessel is positioned within the interior chamber so that an insulation space is defined. The insulation space is at least partially evacuated of air. The one-piece neck tube extends between the inner vessel and the central region of the outer upper jacket. The one-piece neck tube includes a first portion configured to couple with the outer upper jacket, and a second portion configured to couple with the inner vessel such that the second portion extends into the inner vessel. The second portion is integrally formed with the first portion as one-piece.

Abstract: A dewar for storing a cryogenic fluid includes an inner vessel, an outer vessel, and a one-piece neck tube. The outer vessel includes an outer upper jacket and an outer lower jacket configured to be joined and define an interior chamber. The inner vessel is positioned within the interior chamber so that an insulation space is defined. The insulation space is at least partially evacuated of air. The one-piece neck tube extends between the inner vessel and the central region of the outer upper jacket. The one-piece neck tube includes a first portion configured to couple with the outer upper jacket, and a second portion configured to couple with the inner vessel such that the second portion extends into the inner vessel. The second portion is integrally formed with the first portion as one-piece.