Patents by Inventor Wolfgang Tegethoff

Wolfgang Tegethoff 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).

  • Process for recovering raw materials from paper industry mechanical waste sludge
    Patent number: 6207015
    Abstract: Raw materials useable in the manufacture of paper, cardboard and carton are recovered from waste sludge. After precipitation of the coarse particles, the sludge is centrifuged to remove black particles and then divided by fractional screening into its fiber, filler, pigment and agglomerate components. The agglomerate component is shear-treated and again fractionated, while the fibers, fillers and pigments, following further treatment if necessary, are fed to their points of reuse.
    Type: Grant
    Filed: April 15, 1993
    Date of Patent: March 27, 2001
    Assignees: Stora Feldmuhle AG, Omya GmbH
    Inventors: Klaus Templer, Günther Jacobs, Wolfgang Tegethoff