Patents by Inventor Stephan Karpfhammer

Stephan Karpfhammer 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).

  • Coated proppants for fracking extraction methods
    Patent number: 10995264
    Abstract: The invention relates to coated support means for fracking mining methods, containing an inorganic substrate material and a coating containing polymers of one or more ethylenically unsaturated monomers from the group containing vinyl esters of unbranched or branched alkyl carboxylic acids with 1 to 15 C atoms, methacrylic acid esters and acrylic acid esters of alcohols with 1 to 15 C atoms, vinyl aromatics, olefins, dienes and vinyl halides, characterised in that the polymers are obtained by means of radical-initiated polymerisation in an aqueous medium, wherein 0.5 to 20 wt. % of ethylenically unsaturated and silane group-containing monomers are copolymerised, in relation to the total weight of the monomers.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: May 4, 2021
    Assignee: Wacker Chemie AG
    Inventors: Thomas Bastelberger, Abdulmajid Hashemzadeh, Stephan Karpfhammer, Arndt Schlosser
  • COATED PROPPANTS FOR FRACKING EXTRACTION METHODS
    Publication number: 20200157414
    Abstract: The invention relates to coated support means for fracking mining methods, containing an inorganic substrate material and a coating containing polymers of one or more ethylenically unsaturated monomers from the group containing vinyl esters of unbranched or branched alkyl carboxylic acids with 1 to 15 C atoms, methacrylic acid esters and acrylic acid esters of alcohols with 1 to 15 C atoms, vinyl aromatics, olefins, dienes and vinyl halides, characterised in that the polymers are obtained by means of radical-initiated polymerisation in an aqueous medium, wherein 0.5 to 20 wt. % of ethylenically unsaturated and silane group-containing monomers are copolymerised, in relation to the total weight of the monomers.
    Type: Application
    Filed: September 30, 2016
    Publication date: May 21, 2020
    Inventors: Thomas Bastelberger, Abdulmajid Hashemzadeh, Stephan Karpfhammer, Arndt Schlosser