Cold trap

Claim 1

IN A COLD TRAP PREVENTING VAPOR AND SURFACE MIGRATION OF LOW BOILING MOLECULES INTO A VACUUM CAVITY FROM A DIFFUSION PUMP OR THE LIKE, THE COMBINATION COMPRISING A CYLINDRICAL HOUSING HAVING COVER PLATES ON EACH END WITH FLANGED OPENINGS EXTENDING THEREFROM ADAPTABLE FOR CONNECTION TO A VACUUM FACILITY AND TO THE INLET OF A DIFFUSION PUMP, A SEALED COOLANT POT ASSOCIATED WITH STRUCTURE DEFINING A VERTICAL PASSAGE BETWEEN SAID PUMP AND VACUUM INLETS, SAID POT AND PASSAGE DEFINING STRUCTURE BEING SUPPORTED IN SAID HOUSING AND CONSISTING OF A THERMALLY CONDUCTING MATERIAL, MEANS FOR EXTERIORLY FILLING AND VENTING SAID POT, CONDUCTING SURFACES PROTRUDING INTO SAID PASSAGE FROM SAID DEFINING STRUCTURE, SAID SURFACES BEING SHAPED AND DISPOSED THEREIN TO ENSURE ONE OR MORE BOUNCES PER MOLECULE PASSING THROUGH SAID TRAP AT PUMPING PRESSURES BELOW 10-6 MM. HG. AND COOLANT TEMPERATURES BELOW -50* C., A COIL OF STAINLESS STEEL AROUND SAID POT INSIDE SAID HOUSING SEALED AGAINST SAID BOTTOM COVER PLATE AND AGAINST PASSAGE DEFINING STRUCTURE AT THE TOP THEREOF THEREBY PREVENTING VAPORS AND LIQUIDS BYPASSING SAID PASSAGE, SAID COIL SUPPORTING SAID POT IN SAID HOUSING, A SERIES OF THERMALLY CONDUCTING BAFFLE STRIPS SUPPORTED BELOW SAID POT BY SAID LOWER COVER PLATE, AND MEANS FOR COOLING SAID BAFFLE STRIPS WITH A COOLANT FROM A SOURCE EXTERIOR SAID HOUSING.