System and method for charging insulated containers with cryogen

Refrigeration – Storage of solidified or liquified gas – Liquified gas transferred as liquid

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141 4, 222 3, F17C 702

Patent

active

059504374

ABSTRACT:
An insulated container that is open on top and contains phase change material travels along a conveyor. The container initially stops under an infrared sensor whereat its initial interior temperature is determined. A microprocessor uses the temperature data to determine the amount of cryogenic liquid that must be added to the container so that its phase change material will be frozen to a predetermined temperature. A cryogenic liquid dispenser charges the container with an amount of cryogenic liquid determined by the microprocessor. The cryogenic liquid dispenser includes a phase separator which depressurizes cryogenic fluid received from a bulk storage tank. Once the container is charged, it may be loaded with perishables, examples of which include food, blood or chemicals.

REFERENCES:
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patent: 3633372 (1972-01-01), Kimmel et al.
patent: 3797263 (1974-03-01), Shahir et al.
patent: 4475348 (1984-10-01), Remes
patent: 4683921 (1987-08-01), Neeser
patent: 5174357 (1992-12-01), Neeser
patent: 5234035 (1993-08-01), Neeser

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