Patent ID: 7062924

Claim:
A method of manipulation and management of the motion and currents of a liquid cryogen utilized in the freezing or solidifying of individually small volumes of a liquid or units, characterized by transporting liquid cryogen from a reservoir in a first direction upwardly from the reservoir to a single raceway, said cryogen having a transition point where the direction of flow of the cryogen changes to a second direction; managing the speed of travel and volume of the cryogen at it travels in said raceway from the transition point to reduce gasification of the cryogen and any back eddies created in the flow of said cryogen caused by said change of direction; introducing a liquid to be frozen by said cryogen while said cryogen is traveling in said second direction, said liquid being introduced via one or more orifices into said raceway at a distance remote from the cryogen, such that the small volumes of said liquid form into frozen units, adjusting the flow of the cryogen by a control means located in said raceway after the introduction of said liquid to said cryogen.