Patents Assigned to Ahlstrom
  • Patent number: 6224768
    Abstract: The subject-matter of the present invention is a filter paper for laden liquids, with a high adsorption and absorption capacity. This paper, based on cellulose fibers, is filled with organic and/or inorganic pulverulent matter. The powder filling is adapted in quantity and quality to the liquid to be filtered. It finds its application in petrochemical, agri-foodstuffs and papermaking industries.
    Type: Grant
    Filed: December 10, 1997
    Date of Patent: May 1, 2001
    Assignees: Elf Antar France, Ahlstrom
    Inventors: Francois-Pierre Navarre, Bernard Bossand, Pierre Girard, Joseph Dussaud
  • Patent number: 5984110
    Abstract: The subject matter of the present invention is a device for purifying lightly laden water containing particles and/or fatty matter and/or microorganisms in suspension. The device of the invention is a filter comprising a grid (1) on which is placed a filter element (3) consisting of at least one sheet based on fibers and filled with organic and/or inorganic powders. The invention finds its application in all the industries which consume water and especially the crude oil processing industries and the chemical, papermaking and agri-foodstuffs industries.
    Type: Grant
    Filed: December 10, 1997
    Date of Patent: November 16, 1999
    Assignees: Elf Antar France, Ahlstrom
    Inventors: Francois-Pierre Navarre, Bernard Bossand, Pierre Girard, Joseph Dussaud
  • Patent number: 5965091
    Abstract: The present invention relates to a filled paper for gas filtration, with a high adsorption and absorption capacity. This paper, consisting of cellulose fibers, is filled with organic and/or inorganic powders adapted in quantity and in quality to the gas to be treated.It finds its application in the petroleum, chemical, agri-foodstuffs and papermaking industries, in apartment buildings and in office and hospital buildings.
    Type: Grant
    Filed: December 10, 1997
    Date of Patent: October 12, 1999
    Assignees: Elf Antar France, Ahlstrom
    Inventors: Francois-Pierre Navarre, Bernard Bossand, Pierre Girard, Joseph Dussaud