Cryogenic dewar

Claim 2

A CRYOGENIC COOLING APPARATUS USING LIQUID CRYOGEN AS A COOLING MEDIUM COMPRISING: A COOLING CHAMBER THERMALLY ISOLATED FROM THE AMBIENT A THERMALLY CONDUCTIVE HEAT TRANSFER MEMBER INCLUDING COOLING MEANS DISPOSED WITHIN SAID CHAMBER SAID COOLING MEANS HAVING A PLURALITY OF CONDUITS EACH CONDUIT COMMUNICATING WITHIN SAID MEMBER WITH THE REMAINING CONDUITS AT ONE END OF SAID CONDUIT THE OTHER END OF EACH SAID CONDUIT BEING IN RESPECTIVE SEPARATE COMMUNICATION WITH SAID CHAMBER SAID MEMBER HAVING A SURFACE THEREOF OUTSIDE SAID CHAMBER THERMALLY CONDUCTIVE WITH SAID COOLING MEANS FOR COOLING AN OBJECT THERMALLY CONNECTED TO SAID SURFACE, LIQUID CRYOGEN INLET MEANS CONNECTED TO SAID CONDUIT ONE ENDS FOR DISPENSING SAID LIQUID CRYOGEN UNDER PRESSURE TO SAID COMMUNICATING ONE ENDS AND FOR FORCING SAID CRYOGEN TO FLOW THROUGH SAID CONDUITS TO SAID OTHER END OF SAID CONDUITS AND CRYOGEN GAS EXHAUST MEANS CONNECTED TO SAID CHAMBER FOR REMOVING EVAPORATED CRYOGEN FROM SAID CHAMBER TO THEREBY PROVIDE CONTINUOUS COOLING BY SAID LIQUID CRYOGEN WITHIN SAID CONDUITS.

Claim 3

The apparatus of claim 1 wherein the conduits have volumes of different magnitudes so as to regulate the flow of said cryogen through said member.

Claim 4

The apparatus of claim 1 wherein a first conduit is disposed within said member, said first conduit being in communication with said inlet means, said plurality of conduits each having said one end in communication with said first conduit.

Claim 5

The apparatus of claim 3 wherein said first conduit is substantially centrally disposed within said member, said plurality of conduits extending radially outwardly from said first conduit to said chamber to form a plurality of different length conduits, said different lengths tending to regulate the flow of said cryogen through said conduits.

Claim 6

The apparatus of claim 1 further including another plurality of conduits disposed in said member intermediate said first-mentioned plurality of conduits and said chamber, said another plurality of conduits having the ends thereof communicating with said chamber.

Claim 7

The apparatus of claim 1 wherein said cooling means includes a plurality of heat transfer fins disposed on one side of said member in communication with said chamber, the side of said member opposite said fins forming said surface, said conduits being disposed intermediate said opposite sides.

Claim 10

The apparatus of claim 7 wherein one of said conduits has a length different than a second different one of said conduits to thereby maintain the flow pressure of said liquid through said conduits substantially uniform.

Claim 11

The apparatus of claim 8 wherein said conduits are disposed in ordinal spaced relationship with respect to the lengths of said conduits.

Claim 12

A cryogenic apparatus for cooling an array of GaAs diodes comprising: a first outer chamber thermally insulated from the surrounding ambient, a second inner chamber disposed within said first outer chamber, said second chamber being arranged for containing a liquid at cryogenic temperatures, a thermally conductive diode cooling head including cooling means disposed within said second chamber for cooling said head, said cooling means having a plurality of pressurized liquid passing conduits of differing lengths in communication with said second chamber at one end of said conduits, the other ends of said conduits being arranged to receive said cryogenic liquid under pressure, said cooling head including a surface external to said second chamber supporting said diodes and by which said diodes are thermally conductively connected to said cooling means, means connected between said first chamber and said cooling head for supplying said cryogenic liquid under pressure to said conduits other ends for forcing said liquid to flow through said conduits, and means connected between said first and second chambers for exhausting said liquid in the evaporated state from said second chamber.

Claim 13

A cryogenic apparatus for cooling an array of GaAs diodes comprising: a first outer chamber thermally insulated from the surrounding ambient, a second inner chamber disposed within said first outer chamber, said second chamber being arranged for containing a liquid at cryogenic temperatures, a thermally conductive diode cooling head including cooling means disposed within said second chamber for cooling said head, said cooling means having a plurality of pressurized liquid passing conduits of differing lengths in communication with said second chamber at one end of said conduits, the other ends of said conduits being arranged to receive said cryogenic liquid under pressure, said cooling head including a surface external to said second chamber supporting said diodes and by which said diodes are thermally conductively connected to said cooling means, means connected between said first chamber and said cooling head for supplying said cryogenic liquid under pressure to said conduits other ends for forcing said liquid to flow through said conduits, and means connected between said first and second chambers for exhausting said liquid in the evaporated state from said second chamber.

Claim 14

A cryogenic cooling apparatus using a liquid cryogen as a cooling medium comprising: a cooling chamber thermally isolated from the ambient, a thermally conductive heat transfer member including cooling means disposed within said chamber, said cooling means having a plurality of conduits, said member having a surface thereof outside said chamber thermally conductive with said cooling means for cooling an object thermally connected to said surface, a first of said conduits being substantially centrally disposed within said member, said remaining plurality of conduits each having one end in communication within said member with said first conduit and extending radially outwardly from said first conduit with the other end of each conduit in respective, separate communication with said chamber to form a plurality of different length conduits, said different lengths tending to regulate the flow of said cryogen through said conduits, said plurality of conduits being disposed substantially parallel to each other at an acute angle with respect to said first conduit to form a herringbone pattern within said member, liquid cryogen inlet means connected to said first conduit for dispensing said liquid cryogen to said communicating conduit''s one ends, and cryogen gas exhaust means connected to said chamber for removing evaporated cryogen from said chamber to thereby provide continuous cooling by said liquid cryogen within said conduits.

Claim 15

A cryogenic cooling apparatus using a liquid cryogen as a cooling medium comprising: a cooling chamber thermally isolated from the ambient, a thermally conductive heat transfer member including cooling means disposed within said chamber, said cooling means having a plurality of conduits, said member having a surface thereof outside said chamber thermally conductive with said cooling means for cooling an object thermally connected to said surface, a first of said conduits being substantially centrally disposed within said member, said remaining plurality of conduits each having one end in communication within said member with said first conduit and extending radially outwardly from said first conduit with the other end of each conduit in respective, separate communication with said chamber to form a plurality of different length conduits, said different lengths tending to regulate the flow of said cryogen through said conduits, said plurality of conduits being disposed substantially parallel to each other at an acute angle with respect to said first conduit to form a herringbone pattern within said member, liquid cryogen inlet means connected to said first conduit for dispensing said liquid cryogen to said communicating conduit''s one ends, and cryogen gas exhaust means connected to said chamber for removing evaporated cryogen from said chamber to thereby provide continuous cooling by said liquid cryogen within said conduits.

Claim 16

A cooling device comprising: a chamber, a thermally conductive heat transfer member disposed in thermal communication within and without said chamber, and means for supplying a pressurized liquid cryogen to said heat transfer membEr for cooling a heat load secured to said member without said chamber, said heat transfer member having a plurality of conduits disposed therein, said conduits having solely first and second ends with each conduit terminating at one end in communication with said chamber and at the other end in communication with the other ends of all other of said conduits, said supplying means supplying said pressurized liquid cryogen to said communicating conduit''s other ends for forcing said cryogen to flow through said conduits into said chamber.

Claim 17

A cooling device comprising: a chamber, a thermally conductive heat transfer member disposed in thermal communication within and without said chamber, and means for supplying a pressurized liquid cryogen to said heat transfer membEr for cooling a heat load secured to said member without said chamber, said heat transfer member having a plurality of conduits disposed therein, said conduits having solely first and second ends with each conduit terminating at one end in communication with said chamber and at the other end in communication with the other ends of all other of said conduits, said supplying means supplying said pressurized liquid cryogen to said communicating conduit''s other ends for forcing said cryogen to flow through said conduits into said chamber.