Vapor chamber-tank unit

Claim 1

IN WORK TREATING APPARATUS HAVING MEANS FOR CONVEYING WORK CARRIERS HORIZONTALLY STEP-BY-STEP FROM ONE STATION TO ANOTHER AND MEANS FOR MOVING THE WORK CARRIERS VERTICALLY AT AT LEAST SOME OF SAID WORK STATIONS, ONE OF SAID STATIONS HAVING A TANK SECTION OPEN AT THE TOP ADAPATED TO CONTAIN AN AMOUNT OF VOLATILE LIQUID MATERIAL INTO WHICH THE WORK CARRIERS MAY BE SUBMERGED BY SAID MEANS FOR MOVING THE SAME VERTICALLY, AND A VAPOR COLLECTING CHAMBER SECTION ABOVE SAID TANK SECTION AND OPEN AT THE BOTTOM INTO WHICH THE WORK CARRIERS MAY BE RAISED FROM THE VOLATILE LIQUID MATERIAL IN THE TANK SECTION BY SAID MEANS FOR MOVING THE CARRIERS VERTICALLY, MEANS IN SAID VAPOR CHAMBER TO CONDENSE SAID LIQUID MATERIAL WHEN VOLATILIZED, SAID VAPOR CHAMBER BEING CLOSED ON ALL SIDES EXCEPT FOR SAID OPEN BOTTOM AND WORK CARRIER PASSAGE ON TWO OPPOSITELY POSITION WALLS OF SAID CHAMBER, DOORS ADAPTED TO CLOSE AND OPEN SAID PASSAGES, SAID DOORS IN OPEN POSITION BEING ADAPTED O PERMIT ENTRY OF SAID WORK CARRIERS ON SAID CONVEY APPARATUS TO SAID VAPOR CHAMBER AND SAID DOORS HAVING OPENINGS TO RECEIVE SAID CONVEYOR MEANS WHEN IN CLOSED POSITION, AND MEANS IN THE VAPOR CHAMBER SECTION OF SUBSTANTIALLY PREVENTING THE ESCAPE OF SAID VOLATILIZED LIQUID MATERIAL FROM SAID VAPOR CHAMBER WHEN THE DOORS THEREOF ARE IN THE OPEN POSITION.