A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
62/1
A61F 7/10 (2006.01) F25D 3/10 (2006.01) G01N 1/42 (2006.01)
Patent
CA 1208026
COOLING APPARATUS FOR THE RAPID COOLING OF SPECIMENS ABSTRACT OF THE DISCLOSURE A cooling apparatus utilizing liquid nitrogen for cooling specimens to temperatures in the range from -100°C to -195°C in propane, halogenated hydrocarbons, isopentane, or other cooling media. Freezing of the cooling media is avoided by means of an arrangement wherein the liquid nitrogen cools the cooling-bath container and/or the liquifier only initially, but after the desired cooling-bath temperature has been reached, the liquid nitrogen level is lowered to below the height of a protective shell which results in further cooling being only indirect, via solid/solid contacts and via the gas phase. A constant cooling-bath temperature is ensured by means of a thermostatic temperature-control system while trouble-free standby operation is ensured by means of an automatic system for replenishing liquid nitrogen, and by a system for controlling the level of liquid nitrogen. Safe disposal of the cooling media which may be combustible and/or toxic is provided for.
436885
Macrae & Co.
Reichert (c.) Optische Werke Ag
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