Patents by Inventor Helmut Rullmann

Helmut Rullmann 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).

  • Patent number: 5962576
    Abstract: A water-based adhesive is disclosed which contains an aqueous dispersion of one or more phenol resins stabilized by one or more polyacrylates, one or more latexes with one or more halogenated polyolefins and one or more cross-linking agents. The invention also includes a method of priming a substrate in which the substrate is coated with the adhesive as a primer and then with a cover cement and finally bonded to rubber under vulcanization.
    Type: Grant
    Filed: February 13, 1998
    Date of Patent: October 5, 1999
    Assignee: Metallgesellschaft Aktiengesellschaft
    Inventors: Stefan Dehnicke, Ernst List, Helmut Rullmann, Adolf Zellner
  • Patent number: 4988753
    Abstract: A bonding composition comprising an aqueous dispersion is described, which is used to bond natural and synthetic elastomers to metallic and nonmetallic substrates under vulcanizing conditions. Such dispersions contain an organic polymeric film-forming substance, an aromatic polynitroso compound, and a coactivator and optionally contain conventional adhesion promoters, fillers and processing aids. In order to widen the field of application and to ensure a high stability of the bond against corrosive influences, the coactivator particularly consists of phenylene bis-maleic acid imide, but one more of the following may be used: triallyl- cyanurate, triallylisocyanurate, diallylacrylamide, tetraallylterephthalamide, tris(1-methyl-2-propenyl) isocyanurate, trivinylisocyanurate, triallyltrimellitate, diallylphthalate, ethylene-glycoldimethacrylate, trimethylolpropanetrimethacrylate, and 1,3-butyleneglycoldimethacrylate.
    Type: Grant
    Filed: June 15, 1988
    Date of Patent: January 29, 1991
    Assignee: Metallgesellschaft Aktiengesellschaft
    Inventors: Helmut Rullmann, Adolf Zellner, Manfred Gebhard