Patents by Inventor Dirk-Olaf Damrau

Dirk-Olaf Damrau 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).

  • ABRASIVE MATERIAL AND ABRASIVE WHEEL
    Publication number: 20130280995
    Abstract: The invention relates to an abrasive having a base body and abrasive particles applied to the surface of the base body, characterized in that the base body has a multicellular structure. The invention further relates to a process for producing this abrasive and to a grinding tool based on this abrasive.
    Type: Application
    Filed: April 17, 2013
    Publication date: October 24, 2013
    Applicant: Hermes Schleifmittel GmbH & Co. KG
    Inventors: Stephan Dopp, Dirk-Olaf Damrau
  • Process for the preparation of copolyesters
    Patent number: 6297350
    Abstract: Copolyesters are prepared using cyclic esters or carbonates as monomers and a metallic salt of the formula Me2+X2 as catalyst. Me2+ represents Ca, Fe(II), Mg, Mn(II) or Zn, and X is an anion of an aminocarboxylic acid, hydroxycarboxylic acid or a halide. Monomer and catalyst are used in a monomer/catalyst ratio of greater than 100.
    Type: Grant
    Filed: February 15, 2000
    Date of Patent: October 2, 2001
    Assignee: Ferring GmbH
    Inventors: Hans R. Kricheldorf, Ingrid Kreiser-Saunders, Dirk-Olaf Damrau