Patents Assigned to Quarzwerke GmbH
  • FILLERS FOR DENTAL COMPOSITES
    Publication number: 20180015004
    Abstract: A powdery filler for dental materials consisting of particles of feldspar or feldspar derivatives having a mean particle diameter (d50) of from 0.25 to 5 ?m, said particles having a coating with a silicon compound containing reactive groups.
    Type: Application
    Filed: May 25, 2017
    Publication date: January 18, 2018
    Applicant: Quarzwerke GmbH
    Inventors: Dirk Kruber, Thomas Doege
  • FILLERS FOR DENTAL COMPOSITES
    Publication number: 20130178552
    Abstract: A powdery filler for dental materials consisting of particles of feldspar or feldspar derivatives having a mean particle diameter (d50) of from 0.25 to 5 ?m, said particles having a coating with a silicon compound containing reactive groups.
    Type: Application
    Filed: July 12, 2011
    Publication date: July 11, 2013
    Applicant: Quarzwerke GmbH
    Inventors: Dirk Kruber, Thomas Doege
  • Method of reducing the dust generation of silicates
    Patent number: 6830739
    Abstract: The present invention relates to the reduction of the dust generated by silicates, according to the method of the present invention the crushed silicate is surface-coated with a polyorganociloxane also related to a silicate with reduced dust generation and the use of a reduced dust silicate as reinforcing filler in plastic materials.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: December 14, 2004
    Assignee: Quarzwerke GmbH
    Inventors: Norbert Fenten, Wilfried Wolf
  • Analytical sieve apparatus
    Patent number: 5059310
    Abstract: A vertical set of sieves receives the particulate material from a vibrating trough conveyor above the set and is vibrated by an agitator on the machine frame. The sieves are spread apart and then tilted to dump the collected particles into respective funnels. The set can then be swung back and contracted for the the next stage. The funnels are connected to collectors which are automatically weighted.
    Type: Grant
    Filed: August 29, 1990
    Date of Patent: October 22, 1991
    Assignees: Rhewum GmbH, Quarzwerke GmbH
    Inventors: Manfred Fischer, Horst Peterling, Johannes Kaiser, Klaus Keuser, Wilheim Wust