Patents by Inventor Gerd Willmann

Gerd Willmann 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).

  • Patent number: 6387132
    Abstract: Prostheses with artificial joints have only a few metallic and ceramic materials whose compatibility with human or animal tissue has been established. These materials, however, cannot be combined with one another in any manner if a friction pairing occurs as a result, for example, in the case of artificial joints. With artificial joints, joint partners are required to have good mechanical properties as well as tribological properties. According to the invention, a sintered material is thus provided which is comprised of zircon oxide with an addition of 0.1 to 40 wt. % aluminum oxide. This sintered material enables an artificial joint of a prosthesis whose other ceramic materials are comprised of aluminum oxide or zircon oxide with the given proportions of aluminum oxide to be assembled with joint partners.
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: May 14, 2002
    Assignee: Ceramtec AG Innovative Ceramic Engineering
    Inventors: Werner Deppisch, Hans-Georg Pfaff, Gerd Willmann
  • Patent number: 6176140
    Abstract: A ceramic socket or ceramic socket insert for a hip joint prosthesis is tested prior to implantation in a human body by subjecting the portions of the interior of the socket or socket insert to a load that generates stresses that are greater than the physiological load. This may be accomplished either by pressing a hemispherically-shaped deformable material such as polymer or plastic into the interior of the socket or socket insert or by exposing the interior of the socket or socket insert to a fluid under pressure. The interior of the socket or socket insert may be sealed off with a test punch that has a supply line for the fluid. To reduce the amount of fluid that is required, the test punch may have a bulge that projects into the interior of the socket or socket insert and leaves only a gap for the fluid.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: January 23, 2001
    Assignee: Cerasiv GmbH Innovatives Keramik-Engineering
    Inventors: Ralph Autenrieth, Hans-Georg Pfaff, Herbert Richter, Gerd Willmann, Martin Wimmer, Christian Worne
  • Patent number: 4710480
    Abstract: The invention relates to a ceramic molding which is manufactured from high-temperature resistant, fire-resistant or refractory fibers and fine-grain, fire-resistant or refractory materials and, in certain cases, from other customary additives. The ceramic molding is characterized by the fact that its porosity gradually and continuously increases along an axis of the molding from less than 20% to more than 70%. The areas with low porosity comprise the fine-grain, fire-resistant or refractory materials. The areas of high porosity comprise ceramic fiber, such as, fibers of Al.sub.2 O.sub.3, SiO.sub.2, ZrO.sub.2, C, SiC or mixtures thereof. The intermediate areas are constructed of mixtures of ceramic fiber and fire-resistant or refractory materials. The invention also relates to the use of such a ceramic molding method for the manufacture of compound moldings saturated or infiltrated with organic resins, pitch, tar, metals, metal alloys or glasses.
    Type: Grant
    Filed: December 3, 1985
    Date of Patent: December 1, 1987
    Assignee: Didier-Werke AG
    Inventors: Rudiger Buschmann, Rudolf Ganz, Gerd Willmann, Ludwig Wirth, Ingo Elstner, Peter Jeschke