Patents by Inventor Helmut Grass

Helmut Grass 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).

  • Preparation of hydrogen fluoride from fluorspar or calcium fluoride containing waste material
    Publication number: 20110206598
    Abstract: A process for the preparation of HF and anhydrite from reaction of calcium fluoride in the form of fines and sulfuric acid. The content of sulfuric acid is kept in a range where no agglomeration occurs. In such process, dust originating from natural fluorspar can be reacted, as well as synthetic calcium fluoride, e.g., from calcium fluoride and optionally calcium carbonate containing solids from treating a waste gas or waste water with basic calcium compounds to remove contained HF.
    Type: Application
    Filed: April 21, 2009
    Publication date: August 25, 2011
    Applicant: SOLVAY FLUOR GMBH
    Inventors: Helmut Grass, Matthias Hengst, Johannes Eicher
  • Preparation of hydrogen fluoride from calcium fluoride and sulfuric acid
    Publication number: 20100143236
    Abstract: Calcium fluoride fines or residues comprising calcium fluoride fines, e.g. residues from treating waste water or waste gas, e.g. originating from HF or fertilizer production, with calcium oxide or calcium carbonate to remove HF or fluorides can be converted to HF and calcium sulfate by reaction with sulfuric acid in the form of a suspension. Unreacted calcium oxide or calcium carbonate generates sufficient heat to the endothermic reaction between calcium fluoride and sulfuric acid so that no external heat is needed.
    Type: Application
    Filed: January 31, 2008
    Publication date: June 10, 2010
    Applicant: SOLVAY FLUOR GMBH
    Inventor: Helmut Grass