Patent ID: 7493772

Claim:
In apparatus to convert cryogenic fluid to gas, a) a vaporizer having passages to pass the cool or cold cryogenic fluid in heat transfer relation with warming gas flowing downwardly through the vaporizer, b) structure extending below the level of the vaporizer to receive the downwardly flowing gas and to re-direct it to discharge to atmosphere, c) said structure including ducting configured and sized to enhance the down flow and discharge rates of said gas, whereby the temperature of the discharged gas is maintained above the level that would exist in the absence of said ducting, and potential fogging at said discharge is reduced, d) there being legs supporting the vaporizer, said ducting including upright side panels proximate the legs, and wherein said ducting is located directly below major lateral extent of the vaporizer, e) said structure having a lower flow passing region positioned to receive said gas flow from the ducting and to redirect gas flow sidewardly from said region, which is sidewardly open, below said side panels, f) said lower flow passing region located directly below said ducting, g) said lower flow passing region having transverse width substantially the same as the width of said vaporizer and of said ducting between said side panels.