| 摘要 |
1,006,746. Cold retaining vessels. UNION CARBIDE CORPORATION. May 29, 1964 [June 26, 1963], No: 22218/64. Heading F4U. A thermally insulated container for the storage and transport of biological specimens such as bull semen, bone marrow or blood which require refrigeration by liquefied nitrogen comprises a double-walled vessel 1 with an evacuated inter-wall space 4 containing a combined heat reflecting and insulating material 5, 6, the specimen ampules being held in recesses 8 in a porous, integral preformed mass 7 of a sand-lime filler within the inner vessel 3 which is closed by a plug 9 provided with gas escape passages 22. In use the porous mass 7 is saturated with the liquid nitrogen so that spillage thereof is avoided. Whilst both the inner and outer vessels 3, 4 may be of stainless steel or aluminium, the preferred material for the former is a reinforced plastic such as phenol aldehyde condensation resin. The interspace insulation may be in the from of powder or sheet. In the powder from the heat reflecting component is particulate metals, metal oxides, copper or aluminium paint pigments &c., whilst the low heat conducting component is silica alumina or magnesia. In sheet form it consists of reflecting layers of metal foil, e.g. aluminium, silver, gold or copper alternating with insulating layers of plastic such as polyethylene terephthalate or fibrous material such as glass fibre paper. An adsorbent zeolite material is held in a screen container 13 to maintain the vacuum in the space 4. The porous mass 7 consists mainly of calcium silicate admixed with from 4-20% of mineral fibre such as asbestos.
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