Patents Assigned to Dyckerhoff Zementwerke A.G.
  • Method for the production of synthetic wollastonite material
    Patent number: 4165991
    Abstract: A method for the production of synthetic wollastonite material. The treatment involves slag melt which is obtained during the thermal production of phosphorous from crude phosphate. This slag is then treated with water under a preferred embodiment and burned at a certain temperature in an oxidizing atmosphere.
    Type: Grant
    Filed: August 19, 1974
    Date of Patent: August 28, 1979
    Assignee: Dyckerhoff Zementwerke A.G.
    Inventors: Heinrich ZUR Strassen, Eberhard Rauschenfels
  • Expanded synthetic calcium silicates
    Patent number: 3998650
    Abstract: The invention relates to expanded synthetic calcium silicates, particularly of a kind having a white or other pure color.
    Type: Grant
    Filed: August 7, 1974
    Date of Patent: December 21, 1976
    Assignee: Dyckerhoff Zementwerke A.G.
    Inventors: Carl Heinrich Schmitt-Henco, Eberhard Rauschenfels