Patents by Inventor Dieter Buhl

Dieter Buhl 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).

  • Method for the preparation of pigmented curable polyester molding compounds
    Patent number: 6348538
    Abstract: The invention relates to a process for preparing a pigmented curable molding compound comprising mixing together an unsaturated polyester resin, a thermoplastic polymer, a color paste and optionally a filler, and is characterized in that the color paste is obtained by dissolving pigment particles in a solution of a thermoplastic polymer in a suitable solvent. The invention further relates to the color paste itself and to homogeneously and uniformly colored moldings obtained thereform.
    Type: Grant
    Filed: February 16, 1999
    Date of Patent: February 19, 2002
    Assignee: DSM N.V.
    Inventors: Dieter Buhl, Heinz Fuerst, Harald Schneider
  • Method for the apparatus of conductive curable polyester moulding compounds
    Patent number: 6143810
    Abstract: The invention relates to a process for preparing a conductive curable moulding compound with reduced electrical surface resistance, comprising mixing together an unsaturated polyester resin, a thermoplastic polymer, a conductive paste and optionally a filler, and is characterized in that the conductive paste is obtained by dispersing conductive pigment particles in a solution of a thermoplastic polymer in a suitable solvent. The invention further relates to the conductive paste itself and to mouldings having reduced surface resistance, obtained therefrom.
    Type: Grant
    Filed: March 24, 1999
    Date of Patent: November 7, 2000
    Assignee: DSM N.V.
    Inventors: Dieter Buhl, Heinz Fuerst, Harald Schneider, Jan Visser, Joachim Zwecker
  • Molding ofBMC molding materials having improved surface properties
    Patent number: 5558943
    Abstract: Moldings having improved surface properties are produced using BMC molding materials which contain crystalline unsaturated polyesters.
    Type: Grant
    Filed: April 17, 1995
    Date of Patent: September 24, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Joachim Zwecker, Dieter Buhl, Anton Hesse
  • Thickened curable molding compound of unsaturated polyester resins
    Patent number: 5270357
    Abstract: A curable thickened polyester resin molding compound contains from 0.1 to 20 parts by weight of a thermoplastic vinyl polymer which is compatible with the resin and contains acid groups.
    Type: Grant
    Filed: January 24, 1992
    Date of Patent: December 14, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Anton Hesse, Dieter Buhl, Birgit Potthoff-Karl, Axel Sanner
  • Electrophotographic medium with heterocyclic azo photoconductor
    Patent number: 4396695
    Abstract: An electrophotographic recording medium which consists essentially of an electrically conductive base and a photosemiconductive double layer which comprises a first layer containing charge carrier-producing dyes, and a second layer containing one or more compounds which are charge carrier-transporting when exposed to light, wherein the charge carrier-producing dyes are those of the general formula I ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are each hydrogen, halogen, alkyl, nitro or cyano, R.sup.4 is phenyl, halophenyl, alkylphenyl, nitrophenyl or dialkylaminophenyl, and X is oxygen, sulfur, NH or N-phenyl, and the production of this recording medium.
    Type: Grant
    Filed: March 16, 1982
    Date of Patent: August 2, 1983
    Assignee: BASF Aktiengesellschaft
    Inventors: Manfred Dimmler, Gerhard Hoffmann, Dieter Buhl