Patent ID: 7856990
Filing Date: 2010-12-28
Classification: A24D

Abstract:
1. A cigarette comprising a tobacco rod and a filter element connected to the tobacco rod, said filter element having an end proximal to the tobacco rod and an end distal from the tobacco rod, wherein said filter element comprises: a first longitudinally extending section of plasticized fibrous tow filter material positioned at the end of the filter element proximal to the tobacco rod and which consists of filaments having a first weight per unit length; a second longitudinally extending section of plasticized fibrous tow filter material positioned at the end of the filter element distal from the tobacco rod and spaced apart from said first section of filter material and which consists of filaments having a second weight per unit length, the two sections of filter material defining a compartment therebetween, wherein said first section of filter material has a greater particulate removal efficiency than said second section of filter material resulting from said first weight per unit length being lower than said second weight per unit length; a semi-permeable barrier dividing said compartment into region A and region B, wherein the barrier comprises a porous paper or a fibrous tow material; an adsorbent material contained within region A of said compartment; and an ion exchange resin contained within region B of said compartment.