having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa

Full Title

Surface coverings > for exhaust purification, e.g. catalytic reaction > characterised by the distribution of the catalytic coatings > having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa