Patents by Inventor Hans-Joachim Holtzmann

Hans-Joachim Holtzmann 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).

  • Antithrombogenic, non-calcifying material and method of making articles for medical purposes
    Patent number: 4996054
    Abstract: An antithrombogenic, non-calcifying, and elastic material on a basis of polyurethane, characterized by the addition of fatty-acid esters and optionally by the further addition of cross-linking agents that react with water.
    Type: Grant
    Filed: October 19, 1988
    Date of Patent: February 26, 1991
    Assignee: Beiersdorf Aktiengesellschaft
    Inventors: Hanns Pietsch, Holger Kartheus, Hans-Joachim Holtzmann, Gunther Sachau, Helmut Reul
  • Antithrombogenic, non-calcifying material and method of making articles for medical purposes
    Patent number: 4831065
    Abstract: An antithrombogenic, non-calcifying, and elastic material on a basis of polyurethane, characterized by the addition of fatty-acid esters and optionally by the further addition of cross-linking agent that react with water.
    Type: Grant
    Filed: November 20, 1986
    Date of Patent: May 16, 1989
    Assignee: Beiersdorf Aktiengesellschaft
    Inventors: Hanns Pietsch, Holger Kartheus, Hans-Joachim Holtzmann, Gunther Sachau, Helmut Reul
  • Heart valve prosthesis and process for its production
    Patent number: 4778461
    Abstract: A heart valve prosthesis for replacing the aortic valve or the pulmonary valve, consisting of a support ring with at least two commissure supports in each case and flexible cusps, is characterized in that the height of the support ring including the commissure supports is less than the total height of the heart valve prosthesis.
    Type: Grant
    Filed: November 17, 1986
    Date of Patent: October 18, 1988
    Assignee: Beiersdorf AG
    Inventors: Hanns Pietsch, Holger Kartheus, Hans-Joachim Holtzmann, Gunther Sachau, Helmut Reul