Patents by Inventor Herbert Richrath

Herbert Richrath 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).

  • Method of thermal treatment of mineral raw material
    Patent number: 5458833
    Abstract: Method for the production of sintered dolomite, wherein at least carbonate material is ground into particles, formed into a predetermined shape, such as briquettes, deacidified and then heated to a predetermined temperature.
    Type: Grant
    Filed: July 22, 1993
    Date of Patent: October 17, 1995
    Assignee: Dolomitwerke GmbH
    Inventors: Thomas Hammer, Heinzjosef Poggenpohl, Rainer Prange, Herbert Richrath, Alfred Roeder
  • Production of sintered dolomite in a rotary kiln
    Patent number: 5246648
    Abstract: Method for the production of sintered dolomite, wherein at least carbonate material is ground into particles, formed into a predetermined shape, such as briquettes, deacidified and then heated to a predetermined temperature.
    Type: Grant
    Filed: August 25, 1989
    Date of Patent: September 21, 1993
    Assignee: Dolomitwerke GmbH
    Inventors: Thomas Hammer, Heinzjosef Poggenpohl, Herbert Richrath, Alfred Roeder
  • Method for making sintered dolomite with a low porosity and a good hydration stability
    Patent number: 4394454
    Abstract: To produce a dolomite sinter with a low porosity and a good hydration stability made of difficult-to-sinter raw dolomite, the dolomite is milled and caustic burnt dolomite, dolomite hydrate or semi-burnt dolomite in quantities between 3 and 20% by weight relative to the total mixture is added to the raw dolomite powder and is calculated as oxide, as well as foreign oxide, such as Fe.sub.2 O.sub.3, Al.sub.2 O.sub.3 or SiO.sub.2, in such quantities that the total content of the foreign oxide mixture is 1 to 3% by weight.
    Type: Grant
    Filed: January 25, 1982
    Date of Patent: July 19, 1983
    Assignee: Dolomitwerke GmbH
    Inventors: Karlheinz Rosener, Alfred Roeder, Wolfgang Munchberg, Herbert Richrath, Max Chmiel