Patents by Inventor Friedrich Sommermann

Friedrich Sommermann 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).

  • Process for the preparation of magnetic particle dispersions using ball mills and grinding media
    Patent number: 5085889
    Abstract: Magnetic recording media are produced by dispersion of powdered magnetic material in a mixture of solvents, organic polymer binders, dispersants and further conventional additives in a stirred ball mill and subsequent aftertreatment in a ball mill containing grinding media, application of the resulting dispersion as a layer to a substrate and subsequent consolidation of the layer.
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: February 4, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Horst Platz, Peter Engelhardt, Friedrich Sommermann, Albert Kohl, Juergen Klausmann, Reinhold Baur, Peter Heilmann, Hermann Roller
  • Production of magnetic recording media
    Patent number: 5082689
    Abstract: Magnetic recording media are produced by preparing a dispersion of anisotropic magnetic materials in solution in an organic binder using dispersants and further conventional additives, applying the dispersion in the form of a layer onto a nonmagnetic substrate and solidifying the applied magnetic layer, by a process in which a cylindrical grinding chamber is used which is provided with an anchor stirrer or helical stirrer and contains grinding media whose specific gravity is lower than that of the magnetic material.
    Type: Grant
    Filed: August 23, 1990
    Date of Patent: January 21, 1992
    Assignee: Basf Aktiengesellschaft
    Inventors: Ludwig Kreitner, Werner Grau, August Lehner, Hans Reichert, Friedrich Sommermann, Norbert Schneider, Gerd Erhardt
  • Magnetic recording media
    Patent number: 5064721
    Abstract: Magnetic recording media consist of a nonmagnetic base and at least one matnetizable layer which is firmly applied thereon and is based on a magnetic material finely dispersed in a binder, consisting of not less than 50% by weight of a polyurethane, and further conventional additives, wherein the magnetizable layer also contains a saturated, branched hydrocarbon.
    Type: Grant
    Filed: October 31, 1988
    Date of Patent: November 12, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: August Lehner, Albert Kohl, Hermann Roller, Werner Lenz, Ludwig Kreitner, Helmut Kopke, Friedrich Sommermann, Ernst Ricker
  • Magnetic recording media
    Patent number: 4668586
    Abstract: In magnetic recording media consisting of a non-magnetic base and, bonded on top of this, one or more magnetizable layers based on magnetic material finely dispersed in a polymer binder, a lubricant and further conventional additives, the lubricant used is a triethanolamine esterified with oleic acid.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: May 26, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Albert Kohl, Milena Melzer, August Lehner, Norbert Schneider, Eberhard Koester, Werner Balz, Friedrich Sommermann, Ernst Ricker
  • Magnetic recording media
    Patent number: 4656093
    Abstract: Magnetic recording media consisting of a non-magnetic base and, applied thereto, one or more firmly adhering magnetizable layers based on magnetic material finely dispersed in a polymeric binder, at least one lubricant and other conventional additives, wherein the lubricant used is a mixture of zinc stearate which has been rendered hydrophilic and stearylamide.
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: April 7, 1987
    Assignee: Basf Aktiengesellschaft
    Inventors: August Lehner, Albert Kohl, Hermann Roller, Werner Balz, Eerhard Koester, Friedrich Sommermann
  • Magnetic recording media
    Patent number: 4647513
    Abstract: Magnetic recording media consisting of a non-magnetic base and, applied thereto, one or more firmly adhering magnetizable layers based on magnetic material finely dispersed in a polymeric binder, at least one lubricant and further conventional additives, wherein the lubricant used is zinc stearate which has been rendered hydrophilic.
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: March 3, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: August Lehner, Albert Kohl, Werner Balz, Friedrich Sommermann, Milan Velic, Werner Grau, Reinhold Baur
  • Magnetic recording media
    Patent number: 4567108
    Abstract: Magnetic recording media comprise a non-magnetic base which is provided with a magnetic layer consisting of finely divided anisotropic magnetic material which is dispersible in binders and additives, the binder being a mixture of (1) a high molecular weight thermoplastic linear polyurethane, (2) a polyvinylformal binder, a phenoxy resin, a cellulose ester or a vinyl chloride copolymer and (3) an OH-containing polyurethane which is crosslinked with polyisocyanates.
    Type: Grant
    Filed: November 19, 1984
    Date of Patent: January 28, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: August Lehner, Helmut Kopke, Hermann Roller, Werner Balz, Werner Grau, Eberhard Koester, Friedrich Sommermann