Helium fluid refrigerator

Claim 1

A HELIUM REFRIGERATOR COMPRISING: (A) HELIUM FLUID REFRIGERATION-PRODUCING CLOSED CIRCUIT MEANS HAVING A WARN END AND INCLUDING A GAS COMPRESSOR AT THE WARM END AS AN ABOVE-AMBIENT TEMPERATURE COMPONENT, AND INCLUDING AS SUB-AMBIENT TEMPERATURE COLD COMPONENTS: (1) COLD HELIUM FLUID EXPANSION MEANS AT THE COLD END, (2) HEAT EXTRACTION MEANS INTERMEDIATE THE WARM AND COLD ENDS, AND (3) MEANS FOR HEAT EXCHANGING COMPRESSED WARMER HELIUM GAS AND COLDER LOWER PRESSURE HELIUM GAS INTERMEDIATE THE WARM AND COLD ENDS; (B) A HEAT SOURCE AND MEANS FOR HEAT EXCHANGING THE HELIUM FLUID DISCHARGED FROM SAID COLD HELIUM FLUID EXPANSION MEANS (A) (1) WITH SAID HEAT SOURCE; (C) A DOUBLE-WALLED VACUUM INSULATED CONTAINER COMPRISING AN INNER STORAGE VESSEL AND A SURROUNDING OUTER CASING WITH A VACUUM SPACE THEREBETWEEN, AND A REMOVABLE COVER FLANGE ARRANGED AND POSITIONED SO AS TO GAS-TIGHTLY ENCLOSE AND SUSPEND THE SUBAMBIENT TEMPERATURE COLD COMPONENTS OF SAID HELIUM FLUID REFRIGERATION-PRODUCING CLOSED CIRCUIT MEANS (A) FROM SAID COVER FLANGE; AND (D) A METAL THERMALLY CONDUCTING MEMBER WITHIN SAID DOUBLE-WALLED VACUUM INSULATED CONTAINER TRANSVERSELY SPACED AND SUSPENDED BETWEEN THE WARM AND COLD ENDS OF THE SAID HELIUM FLUID REFRIGERATIONPRODUCING CLOSED CIRCUIT MEANS (A), BEING THERMALLY ASSOCIATED WITH SAID HEAT EXTRACTION MEANS AND ALSO THERMALLY ASSOCIATED WITH A RELATIVELY WARMER REGION OF THE STORAGE VESSEL INNER WALL SO AS TO RECEIVE HEAT FROM SUCH REGION FOR SOLID CONDUCTIVE TRANSFER TO THE HEAT EXTRACTOR MEANS.