Cold trap

Claim 1

A CRYOGENIC-FLUID IMMERSIBLE COLD TRAP FOR SEPARATING GASES WITH DIFFERING FREEZING TEMPERATURES FROM A MIXTURE OF SUCH GASES, SAID COLD TRAP COMPRISING: A HOLLOW MEMBER FOR IMMERSION IN A BODY OF CRYOGENIC FLUID HELD IN A SUITABLE CONTAINER, SAID HOLLOW MEMBER COMPRISING BOTTOM, SIDE AND TOP WALL MEANS DEFINING A CLOSED CHAMBER; AN INLET EXTENDING THROUGH SAID WALL MEANS AT THE BOTTOM OF SAID CHAMBER THROUGH WHICH SUCH CRYOGENIC FLUID MAY BE ADMITTED; AN OUTLET EXTENDING THROUGH SAID WALL MEANS AT A POINT SPACED FROM AND ABOVE SAID INLET THROUGH WHICH SUCH CRYOGENIC FLUID MAY BE DISCHARGED; CONDUIT MEANS WITHIN SAID CHAMBER AND INTERCONNECTING SAID CRYOGENIC FLUID INLET AND OUTLET, SAID CONDUIT MEANS HAVING A COEFFICIENT OF THERMAL CONDUCTIVITY SUBSTANTIALLY GREATER THAN THAT OF THE WALL MEANS OF SAID CHAMBER AND DEFINING A PASSAGE EXTENDING THROUGH SAID CHAMBER BUT NOT IN COMMUNICATION WITH THE INTERIOR THEREOF AND THROUGH WHICH SUCH CYROGENIC FLUID MAY PASS; FIN MEANS ON THE EXTERIOR OF SAID CONDUIT MEANS IN SAID CHAMBER; INLET AND OUTLET PORTS FOR SAID GASEOUS MIXTURE EXTENDING THROUGH SAID WALL MEANS AT THE TOP OF SAID CHAMBER; AND DIRECTING MEANS IN SAID CHAMBER BETWEEN SAID GASEOUS MIXTURE INLET AND OUTLET PORTS FOR CAUSING GASEOUS MIXCTURE INTRODUCED THROUGH SAID GASEOUS MIXTURE INLET TO FLOW OVER SAID FIN MEANS TO REACH SAID GASEOUS MIXTURE OUTLET, WHEREBY WHEN SAID COLD TAP IS IMMERSED IN A BODY OF CRYOGENIC FLUID AND SAID FLUID ENTERS SAID CRYOGENIC FLUID PASSAGE THROUGH THE BOTTOM OF SAID IMMERSIBLE MEMBER, SAID FLUID WILL ABSORB HEAT THROUGH THE WALLS OF SAID CONDUIT MEANS FROM GASEOUS MIXTURE FLOWING OVER SAID FIN MEANS WIHIN SAID CHAMBER AND MAY THEN BOIL OFF THROUGH SAID CRYOGENIC FLUID OUTLET.