Double-walled container

Claim 1

A LIGHTWEIGHT PORTABLE CONTAINER FOR STORING WITH RELATIVELY LOW VAPORIZATION LOSSES LIQUEFIED GAS HAVING A BOILING POINT BELOW ABOUT 233*K., INCLUDING AN INNER VESSEL OF LESS THAN ABOUT 50 LITERS LIQUID CAPACITY FOR HOLDING A LIQUEFIED GAS BODY, AN OUTER CASING ENCLOSING AND SEPARATING SAID INNER VESSEL FROM THE ATMOSPHERE, AT LEAST SAID OUTER CASING BEING FORMED FROM MATERIAL OF THE GROUP CONSISTING OF ALUMINUM AND ALUMINUM ALLOYS TO SUBSTANTIALLY REDUCE THE OVERALL WEIGHT OF SUCH PORTABLE CONTAINER, A SEALED SPACE UNDER A SUBSTANTIALLY PERMANENT VACUUM PRESSURE NOT SUBSTANTIALLY GREATER THAN 5000 MICRONS OF MERCURY ABSOLUTE BETWEEN SAID INNER VESSEL AND SAID OUTER CASING, SAID SPACE CONTAINING AN OPACIFIED INSULATING JACKET HAVING RELATIVELY HIGH INSULATING EFFICIENCY AT RELATIVELY POOR VACUUMS, AND A GAS ADSORBENT MATERIAL COMMUNICATING WITH OPACIFIED INSULATION TO MAINTAIN THE SPACE UNDER VACUUM, A HOLLOW LOWER SUPPORT MEMBER FORMED OF LOW HEAT CONDUCTIVE PLASTIC MATERIAL AND HAVING ONE END FIXEDLY MOUNTED AGAINST THE INSIDE WALL OF THE OUTER CASING AND THE OTHER END POSITIONED TO EFFECTIVELY SLIDABLY AND TELESCOPICALLY ENGAGE A LOWER PORTION OF THE INNER VESSEL OUTER WALL, A RELATIVELY LARGE ACCESS OPENING IN SAID INNER VESSEL AND A HOLLOW ELONGATED NECK TUBE HAVING AN INSIDE DIAMETER OF ABOUT 1 1/4 INCHES AND ONE OPEN END COMMUNICATING WITH THE LIQUEFIED GAS BODY THROUGH SAID LARGE ACCESS OPENING AND A SECOND OPEN END COMMUNICATING WITH THE ATMOSPHERE FOR FILLING AND EMPTYING SAID VESSEL THERETHROUGH, SAID HOLLOW NECK TUBE SUSPENDING THE INNER VESSEL FROM THE TOP PORTION OF THE OUTER CASING, A LOW HEAT CONDUCTIVE PLUG RECEIVABLE IN AND SUBSTANTIALLY FILLING THE SECOND OPEN END OF SAID HOLLOW NECK TUBE TO CAUSE GAS VAPOR FORMED TO FLOW UPWARDLY CLOSE TO AND IN SUSTAINED CONTACT WITH THE INSIDE WALL SURFACE OF SAID HOLLOW NECK TUBE, THEREBY RECOVERING THE SENSIBLE REFIGERATION OF SUCH VAPORS, AND REDUCING THE NET HEAT CONDUCTING CHARACTERISTIC OF THE NECK TUBE.