Patent ID: 7036322

Claim:
A cryogenic tank assembly for holding a cryogenic fluid comprising: a. a vessel defining a cryogen space, b. a ullage vessel defining a ullage space, c. a fill conduit comprising i. an inlet for receiving said cryogenic fluid from outside said cryogenic tank assembly, ii. an exit within said cryogen space for delivering said cryogenic fluid to said cryogenic space during a course of filling of said cryogenic space, iii. a broad passage defining a broad cross-sectional area, and, iv. a narrow passage defining a narrow cross-sectional area that is smaller than said broad cross-sectional area, wherein said broad passage is downstream from said narrow passage, d. an ullage conduit defining an ullage cross-sectional area that is smaller than said narrow cross-sectional area said ullage conduit comprising: i. an ullage exit into said fill conduit within said narrow passage, and ii. an ullage opening into said ullage space, wherein said cryogenic fluid is restricted from said ullage space during said course of filling.