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(11)    Patent No :    AP 2134   
(21)    Application No :    AP/P/2004/002985   
(22)    Filing Date :    30.07.2002   
(24)    Date of Grant &    13.07.2010   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
US    60/309,435    01.08.2001
US    60/309,388    01.08.2001
US    10/011,841    30.10.2001
e al
(84)    Designated State

GM    GH   KE   LS   MW  MZ   SL   SD   SZ

UG    ZM   ZW

(73) Applicant(s)

BROWN & WILLIAMSON TOBACCO CORPORATION, 1500 Brown & Williamson Tower, Louisville, Kentucky 40202, United States of America

(72) Inventors

FIGLAR James N., United States of America

TUCKER Brian E., United States of America

ST. CHARLES F. Kelly, United States of America

et al

(74) Representative

FISHER CORMACK & BOTHA
 

(51)  International  Classification   A24D 3/04 (2007.01)    A24D 3/00 (2007.01)
A24D 3/00 (2007.01)    A24D 3/16 (2007.01)


(54)    Title

Cigarette filter

(57)    Abstract

A cigarette filter that includes a multiple section filter which reduces the level of predetermined smoke constituents. The filter (130) consists of a fibrous filter plug (132) located at the mouth-end of the cigarette, a section (136) containing a sele ctive adsorbent material, and a section (134) containing a general adsorbent material. The selective adsorbent material, such as a phenol-formaldehyde resin matrix surface-functionalized with mainly primary and secondary amine functional groups, removes specific smoke constituents from the tobacco smoke. The general adsorbent material, such as activated charcoal, is preferably capable of adsorbing a range of chemical compounds without a high degree of specificity. Structurally, the fibrous filter plug, the selective adsorbent section, and the general adsorbent section are co-axially aligned in tandem.


(56)    Documents Cited :    US 6257242 X    US 3280823 X    BE 647803 X    US 3266973 X    US 2815760 X

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