Patents by Inventor Christian Jehn-Rendu

Christian Jehn-Rendu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20040040683
    Abstract: The invention relates to an improved paper production process, according to which a branched polymer prepared in reverse phase emulsion is used as the main retention aid, and then bentonite is used as the secondary retention aid (a dual type system). The two additions are separated by a stage for shearing the fibrous suspension (or mass).
    Type: Application
    Filed: September 3, 2003
    Publication date: March 4, 2004
    Applicant: SNF SA
    Inventors: Rene Hund, Christian Jehn-Rendu
  • Publication number: 20030150575
    Abstract: The invention relates to an improved paper production process, according to which a branched polymer prepared in reverse phase emulsion is used as the main retention aid, and then bentonite is used as the secondary retention aid (a dual type system). The two additions are separated by a stage for shearing the fibrous suspension (or mass).
    Type: Application
    Filed: August 27, 2002
    Publication date: August 14, 2003
    Applicant: SNF SA
    Inventors: Rene Hund, Christian Jehn-Rendu
  • Patent number: 6579417
    Abstract: According to the present invention, a cross-linked polymer or copolymer formed by reverse phase emulsion polymerization from suitable water-soluble monomers or from mixtures of such monomers is used as a retention agent. The process according to the invention is characterized in that the cross-linked polymer is sheared before its introduction or injection into the suspension to be flocculated. This results in a distinct improvement in the retention, formation, drainage and other properties of the paper or paperboard sheet thus obtained, as a function of the shearing.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: June 17, 2003
    Assignee: SNF S.A.
    Inventors: Rene Hund, Christian Jehn-Rendu
  • Patent number: 5902455
    Abstract: Process for improving retention during the manufacture of paper, board or the like, which consists:first of all in adding to the fibrous suspension a first retaining agent formed by a cationic polymer of high molecular weight,then, optionally in shearing the flocs obtained,and finally, in adding to the suspension a second retaining agent of inorganic nature, characterized in that the second retaining agent is a kaolin pigment.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: May 11, 1999
    Assignee: S.N.F.
    Inventors: Rene Hund, Christian Jehn-Rendu