Plate and fin type heat exchanger

Claim 1

IN A PLATE-AND-FIN TYPE HEAT EXCHANGE WHICH COMPRISES A CORE SECTION HAVING A SET OF FLUID PASSES FOR EACH OF AT LEAST TWO FLUID STREAM WITH MULTIPLE FLOW PASSAGES IN EACH SET OF FLUID PASSES FOR PROVIDING HEAT EXCHANGE BETEEEN THE FLUID STREAMS PASSING THROUGH THEIR RESPECTIVE SET OF FLUID PASSES AND WHEREIN AT LEAST ONE OF SET OF SAID FLUID PASSES IS PACKED WITH PARTICLED MATERIAL, SAID HEAT EXCHANGER HAVING INLET AND OUTLET MEANS FOR SAID FLUID STREAM, THE IMPROVEMENT THEREIN WHICH COMPRISES: AND INLET HEADER AT ONE END OF THE SAID PLATE-AND-FIN TYPE HEAT EXCHANGER IN OPEN FLUID COMMUNICATION WITH THE SAID SET OF FLUID PASSES PACKED WITH PARTICLED MATERIAL, SAID INLET MEANS FOR ONE OF SAID FLUID STREAMS OPENING INTO SAID INLET HEADER AND A PARTICLED MATERIAL INLET TO SAID INLET HEADER, AND AN OUTLET HEADER AT THE OTHER END OF THE SAID PLATEAND-FIN TYPE HEAT EXCHANGER IN OPEN FLUID COMMUNICATION WITH THE SAID SET OF FLUID PASSES PACKED WITH PARTICLED MATERIAL, SAID OUTLET MEANS FOR THE FLUID STREAM PASSING THROUG THE SAID SET OF FLUID PASSES PACKED WITH PARTICLED MATERIAL OPENING INTO SAID OUTLET HEADER, AND A PARTICLED MATERIAL OUTLET TO SAID OUTLET HEADER, SUCH HEADERS BEING PACKED WITH PARTICLED MATERIAL AS TO THEREBY CONFINE PARTICLED MATERIAL WITHIN THE SAID SET OF FLUID PASSES PACKED WITH PARTICLED MATERIAL; A FLUID-PERMEABLE, PARTICLED-MATERIAL-IMPREVIOUS MEMBER DISPOSED WITHIN EACH OF SAID INLET AND OUTLET HEADERS IN POSITION TO PREVENT PARTICLED MATERIAL LEAKAGE INTO THE RESPECTIVE FLUID INLET AND FLUID OUTLET OF SAID HEADERS AND SUCH THAT THE INTERIORS OF SAID HEADERS ARE IPEB TO THE RESPECTIVE PARTICLED MATERIAL INLET AND OUTLET.