| (19) |
 |
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(11) |
EP 2 510 815 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
30.10.2013 Bulletin 2013/44 |
| (43) |
Date of publication A2: |
|
17.10.2012 Bulletin 2012/42 |
| (22) |
Date of filing: 27.04.2005 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI
SK TR |
|
Designated Extension States: |
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AL BA HR LV MK YU |
| (30) |
Priority: |
10.05.2004 US 842165
|
| (62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
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05740341.2 / 1746906 |
| (71) |
Applicant: Brown & Williamson Holdings, Inc. |
|
Wilmington, DE 19803 (US) |
|
| (72) |
Inventors: |
|
- Jackson, Thaddeus J.
North Carolina, 27265 (US)
- Caraway, John W. Jr
North Carolina, 27012 (US)
|
| (74) |
Representative: Gill, Siân Victoria et al |
|
Venner Shipley LLP
200 Aldersgate
London EC1A 4HD
London EC1A 4HD (GB) |
|
| |
|
| (54) |
Selective filtration of cigarette smoke using chitosan derivatives |
(57) A smoking article filter having a porous resin with a high surface area to mass ratio
comprised of a chitosan derivative. Preferred embodiments include chitosan cross-linked
with glutaraldehyde and chitosan cross-linked with glyoxal. The chitosan derivative
provides for the selective filtration of cigarette smoke, particularly for the removal
of aldehydes, hydrogen cyanide, heavy metals and carbonyls.