The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 2011
Filed:
Oct. 13, 2003
Applicant:
Paul Francis Clarke, Northumberland, GB;
Inventor:
Paul Francis Clarke, Northumberland, GB;
Assignee:
Filtrona International Limited, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A24D 1/04 (2006.01); A24D 3/06 (2006.01); A24D 3/04 (2006.01); A24D 1/02 (2006.01); A24F 13/06 (2006.01); A24F 1/20 (2006.01); A24F 7/04 (2006.01); A24F 7/00 (2006.01); A24B 15/00 (2006.01); A24B 1/04 (2006.01); D21H 11/00 (2006.01); D21H 13/00 (2006.01); D21H 15/00 (2006.01); D21H 17/00 (2006.01); D21H 19/00 (2006.01); D21H 21/00 (2006.01); D21H 23/00 (2006.01); D21H 25/00 (2006.01); D21H 27/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A tobacco smoke filter which has a tar retention of at most 50% and comprises a relatively high draw resistance downstream filtering plug of at most 50% tar retention, a relatively low draw resistance upstream filter plug of at most 22% tar retention spaced longitudinally upstream therefrom, and a filter wrapper engaging around and joining the spaced plugs to define a cavity therebetween.