Patents by Inventor Gerd Fischer

Gerd Fischer 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).

  • Reversible optical recording medium of the phase charge type
    Patent number: 5270149
    Abstract: The optical recording medium comprises at least one substrate and at least one storage layer of the phase change type with at least three reversibly interswitchable states of differing optical behavior, the difference in reflectivity between at least one pair of states being greater than between the amorphous and the crystalline state.
    Type: Grant
    Filed: January 6, 1993
    Date of Patent: December 14, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Stefan Iselborn, Gerd Fischer, Hartmut Hibst
  • Process for the preparation of penem compounds
    Patent number: 5198544
    Abstract: Compound I ##STR1## is obtained by reaction of compound II with compound III
    Type: Grant
    Filed: February 25, 1991
    Date of Patent: March 30, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karl-Heinz Budt, Walter Durokheimer, Gerd Fischer, Rolf Horlein, Reiner Kirrstetter, Rudolf Lattrell
  • Production of a magnetic recording medium
    Patent number: 5192583
    Abstract: A magnetic recording medium, essentially consisting of a polymeric, web-like substrate and a coherent thin layer of a ferromagnetic material, is produced in a chamber under reduced pressure by depositing a vapor jet of the ferromagnetic material onto the moving substrate surface guided over a roller-like cooling element.
    Type: Grant
    Filed: April 10, 1992
    Date of Patent: March 9, 1993
    Assignee: BASF Magnetics GmbH
    Inventors: Hans J. Richter, Hartmut Hibst, Gerd Fischer
  • Production of a magnetic recording medium
    Patent number: 5188865
    Abstract: A magnetic recording medium, consisting essentially of a polymeric, web-like substrate and a coherent thin layer of a ferromagnetic material, is produced in a chamber under reduced pressure by depositing a vapor jet of the ferromagnetic material onto the moving substrate surface guided over a cylindrical drum, by a process in which the axis of the cooling element is inclined relative to the plane of the evaporator unit.
    Type: Grant
    Filed: April 10, 1992
    Date of Patent: February 23, 1993
    Assignee: BASF Magnetics GmbH
    Inventors: Hans J. Richter, Hartmut Hibst, Gerd Fischer
  • Cephalosporin derivatives
    Patent number: 5100887
    Abstract: Cephemcarboxylic acid esters of the general formula ##STR1## pharmaceutical preparations which are active against bacterial infections, which contain such cephem derivatives, a process for the preparation of the cephem derivatives and the pharmaceutical preparations, and also the use of the cephem derivatives for combating bacterial infections.
    Type: Grant
    Filed: July 23, 1990
    Date of Patent: March 31, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Friedhelm Adam, Jurgen Blumbach, Walter Durckheimer, Gerd Fischer, Burghard Mencke, Dieter Isert, Gerhard Seibert