Patent ID: 8375709

Claim:
An exhaust mixer for use in an engine exhaust system downstream from an additive injector, the mixer comprising: a pair of interlocked blade structures, each of the blade structures comprising a longitudinally extending spine having a width between opposite first and second sides, the spine having longitudinal ends for engagement with a support structure of the engine exhaust system, a first, pair of vanes extending from the first side of the blade structure spine, and a second pair of vanes extending from the opposite second side of the blade structure, a slot between the first pair of vanes extending from the first side of the blade structure spine toward the opposite second side of the blade structure spine; wherein said pair of blade structures are interlocked with the spine of one of said blade structures received in the slot in the other of said blade structures and the spine of the other of said blade structures received in the slot of said one of said blade structures.