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:
Aug. 25, 2009
Filed:
Oct. 09, 2003
Kay Rökman, Karhula, FI;
Hanna Rahiala, Karhula, FI;
Pascale Escaffre, La Cote St Andre, FR;
Valérie Chauve, Vienne, FR;
Joseph Dussaud, Vienne, FR;
Menno Dufour, Lyons, FR;
Gilles Gauthier, Salaise sur Sanne, FR;
Kay Rökman, Karhula, FI;
Hanna Rahiala, Karhula, FI;
Pascale Escaffre, La Cote St Andre, FR;
Valérie Chauve, Vienne, FR;
Joseph Dussaud, Vienne, FR;
Menno Dufour, Lyons, FR;
Gilles Gauthier, Salaise sur Sanne, FR;
Ahlstrom Corporation, Helsinki, FI;
Abstract
Filtering medium based on activated carbon which is characterized in that it comprises three superposed layers, respectively an inner layer and two outer layers, the inner layer consisting of 80 to 95% by dry weight of activated carbon, the balance for 100% consisting of organic and/or inorganic chemical fibres, the first outer layer comprising from 45 to 95% by dry weight of organic and/or inorganic chemical fibres, the balance for 100% consisting of activated carbon and/or of a material having a density of less than 0.9, the second outer layer comprising from 5 to 25% by dry weight of activated carbon, the balance for 100% consisting of organic and/or inorganic chemical fibres, and in that the weight of the inner layer is between 40 and 200 g/m2 and the weight of the outer layers is between 10 and 100 g/m2.