Patent ID: 8955524
Filing Date: 2015-02-17
Classification: A24D

Abstract:
1. A filter for a cigarette or other smoking article, comprising: a porous filter rod; an inner porous material sheet wrapped around the filter rod, the filter rod and the inner porous material sheet being shaped to provide a plurality of continuously grooved regions each containing a plurality of grooves extending parallel to an axis of the filter rod, the grooves having a circumferential distribution around the filter rod such that there are at least two groove-free regions of a circumference of the filter rod which are free from the grooves, each of the plurality of continuously grooved regions subtending an angle of the circumference of the filter rod greater than an angle of the circumference of the filter rod subtended by any one of the at least two groove-free regions, wherein each of the plurality of continuously grooved regions does not include a groove-free region; and an outer material sheet wrapped around the inner porous material sheet.