Patent ID: 8147764

Claim:
A honeycomb structure having a longitudinal direction, comprising: a first end face; a second end face opposite to the first end face along the longitudinal direction; four honeycomb units each comprising: inorganic particles; an inorganic binder; and a plurality of cell walls extending from the first end face to the second end face to define a plurality of cells, the plurality of cell walls including a first cell walls extending along a first direction in a cross sectional plane perpendicular to the longitudinal direction and a second cell walls extending along a second direction substantially perpendicular to the first direction in the cross sectional plane; and adhesive layers provided between the four honeycomb units to connect the four honeycomb units each other, the adhesive layers extending in a first extending direction and a second extending direction substantially perpendicular to the first extending direction in the cross sectional plane, a minimum angle between the first direction and the first extending direction or the second extending direction is approximately 22.5 degrees to approximately 45 degrees, wherein each of the honeycomb units has a fan shape in the cross sectional plane, wherein: each of the cells are through holes that are open at both an upstream end and a downstream end thereof and each of the four honeycombs units forming substantially a quarter of an overall cross sectional area of the honeycomb structure.