Patents by Inventor Johann Andries Bester

Johann Andries Bester 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: 5932508
    Abstract: A method of manufacturing a metal bonded abrasive product such as a saw or drill segment or bead for a diamond wire is provided. The method includes the steps of providing a mixture of the metal, in particulate form, and the abrasive particles, cold pressing the mixture to the desired final shape at a pressure in the range 320 to 1500 MPa to produce a cold pressed product at a temperature in the range 900 to 1300.degree. C. under conditions which inhibit degradation of the abrasive particles and the particulate metal. The product, after free sintering, will generally have a relatively high porosity, for example, a porosity of 10 to 25 percent by volume.
    Type: Grant
    Filed: September 3, 1997
    Date of Patent: August 3, 1999
    Inventors: Caoimhin Padraig Armstrong, Patrick Gerard Ryan, Christopher Thomas Peters, Christian Weiss, Michael O'Sullivan, Johann Andries Bester, Martin Walter Powell