Patent ID: 8616269

Claim:
A heat exchanger comprising: a plurality of plates each having first and second heat transfer surfaces on reverse sides thereof, said plates being arranged in a stack with spacings between mutually facing heat transfer surfaces of adjacent plates, alternate spacings in the stack providing respectively, a first fluid path for a first fluid and a second fluid path for a second fluid, and wherein the plates are arranged in a plurality of groups, each comprising at least two plates; a plurality of pins, wherein the pins are distinct from the plates until attachment therewith, and wherein the pins are arranged in mutually orthogonal rows and columns, and further wherein within at least one of the groups of plates: first pins of the plurality thereof are arranged to bridge adjacent plates of the group, second pins of the plurality thereof extend from outermost heat transfer surfaces of the group, said second pins terminating in free ends at least some pins of the plurality thereof extend only from the first heat transfer surface of at least one plate in the group and are offset with respect to pins extending only from the second heat transfer surface of that plate.