Patents by Inventor Bernd Dirks

Bernd Dirks 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).

  • Paper coating slip containing n-vinylformamide
    Patent number: 6969444
    Abstract: Paper coating slips whose additives comprise addition polymers or copolymers containing N-vinylformamide in (co)polymerized form, and their use.
    Type: Grant
    Filed: November 2, 2001
    Date of Patent: November 29, 2005
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Bernd Dirks, Heinrich Ullrich, Thierry Blum, Norbert Mahr, Stefan Frenzel, Martin Wendker
  • Paper coating slip containing n-vinyl formamide
    Publication number: 20040020615
    Abstract: Paper coating slips whose additives comprise addition polymers or copolymers containing N-vinylformamide in (co)polymerized form, and their use.
    Type: Application
    Filed: May 2, 2003
    Publication date: February 5, 2004
    Inventors: Friedrich Linhart, Bernd Dirks, Heinrich Ullrich, Thierry Blum, Norbert Mahr, Stefan Franzel, Martin Wendker
  • Method of producing paper, paperboard and cardboard
    Patent number: 6673206
    Abstract: Paper, board and cardboard are produced by a process in which a paper stock is drained in the presence of condensates of basic amino acids with sheet formation. In particular, homo- and cocondensates of lysine and the crosslinked condensates obtainable therefrom by reaction with crosslinking agents are used in amounts of from 0.01 to 5% by weight, based on dry paper stock, as a means of increasing the dry and wet strength and the absorptivity of paper, for fixing anionic dyes and interfering substances in the paper, for increasing the drainage rate and the retention as well as the efficiency of synthetic anionic and cationic retention aids in the production of paper, board and cardboard by draining a paper stock with sheet formation.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: January 6, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Bernd Dirks, Rainer Tresch, Bernhard Mohr, Dietrich Fehringer
  • Process for producing paper and cardboard
    Patent number: 6132558
    Abstract: Paper and cardboard are produced by draining pulps, with sheet formation and drying of the sheets, by a process in which first(a) polyethyleneimines having a molar mass M.sub.w of more than 500,000 or polymers containing vinylamine units and having a molar mass of from 5000 to 3 million and then(b) cationic polyacrylamides or polymers containing vinylamine units, the molar masses M.sub.w of the polymers each being at least 4 million,are added to the pulps, and the pulp is then subjected to at least one shearing stage and is flocculated by adding bentonite, colloidal silica or clay.
    Type: Grant
    Filed: January 8, 1999
    Date of Patent: October 17, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Rainer Dyllick-Brenzinger, Hubert Meixner, Friedrich Linhart, Dietmar Monch, Klaus-Dieter Gerber, Bernd Dirks, Peter Baumann