Portable cryogenic liquid storage-gas supply system

Claim 1

A cryogenic liquid storage-gas supply system including a double-walled cryogenic liquid storage container having top and bottom ends and being invertible between top-up dispensing and bottom-up filling positions, said container comprising: (i) an inner wall forming an enclosed volume for receiving a cryogenic liquid; (ii) an outer wall substantially coextensive with and spaced from said inner wall arranged and constructed with respect to said inner wall so as to form an evacuable space therebetween; (iii) thermal insulation material disposed within said evacuable space; (iv) liquid withdrawal-gas vent conduit means including a continuous tube penetrating and gas tightly joined to said inner and outer walls at the container top end said tube having a first end terminating near the enclosed volume bottom end and a second end terminating outside the container top end; (v) gas vent-liquid fill conduit means including a tube positioned within said liquid withdrawal-gas vent tube and penetrating the wall of said liquid withdrawal-gas vent tube at a position located near the enclosed volume top end and extending through the second end of said liquid withdrawal-gas vent tube, said gas vent-liquid fill tube having a first end terminating near the enclosed volume top end and oriented to discharge a fluid directed away from said container top end and a second end terminating outside the container top end; (vi) means within said enclosed volume external to said liquid withdrawal-gas vent tube for deflecting the fluid discharged from said first end of said gas vent-liquid fill tube toward the container top end.