Degreasing machine with cooling jacket

Claim 1

IN DEGREASING APPARATUS, A TANK HAVING AN ENCLOSING WALL AND ADAPTED TO CONTAIN A DEGREASING SOLVENT AND VAPORS THEREOF, COOLING JACKET MEANS EXTENDING ABOUT VAPORS THEREOF, COOLING JACKET MEANS EXTENDING ABOUT SAID TANK EXTERIORLY AND REMOTE FROM THE BOTTOM THEREOF, SAID JACKET MEANS COMPRISING UPPER AND LOWER CHANNEL ELEMENTS AND AN INTERMEDIATE CHANNEL ELEMENT FIXED TO SAID UPPER AND LOWER ELEMENTS AND TO THE TANK WALL, SAID UPPER AND LOWER CHANNEL ELEMENT BEING CLOSED AT THE INNER SIDES THEREOF BY THE CORRESPONDING PORTIONS OF THE TANK WALL DEFINING THEREWITH UPPER AND LOWER PASSAGES EXTENDING SUBSTANTIALLY COMPLETELYY ABOUT SAID TANK AND HAVING AN INNER WALL OF SUBSTANTIAL AREA EXPOSED INTERIORLY OF SAID TANK, SAID CHANNEL ELEMENTS BEING RIGIDLY CONNECTED TOGETHER AND SAID TANK WALL EFFECTIVE FOR REINFORCING THE LATTER, A DUCT BRIDGING SAID INTERMEDIATE CHANNEL ELEMENT AND ESTABLISHING COMMUNICATION BETWEEN SAID PASSAGES, EACH OF THE LATTER HVING A COOLANT CONNECTION AT THE AREA THEREOF ADJACENT SAID DUCT, AND BAFFLE MEANS IN SAID PASSAGES EFFECTIVE FOR CAUSING COOLANT ENTERING ONE OF SAID PASSAGES TO FLOW THERETHROUGH IN ONE DIRECTION AROUND SAID TANK TO SAID DUCT AND THROUGH THE LATTER TO THE OTHER PASSAGE AND THEN THROUGH SAID OTHER PASSAGE IN THE OPPOSITE DIRECTION AROUND THE TANK TO SAID COOLANT CONNECTION OF SAID OTHER PASSAGE, WHEREBY THE COOLANT FLOWING THROUGH SAID ONE PASSAGE IS PREHEATED BY HEAT ABSORBED FROM THE SOLVENT VAPORS WITHIN THE TANK BEFORE IT ENTERS SAID OTHER PASSAGE.