Patents by Inventor Hans-Joachim Purps

Hans-Joachim Purps 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: 6902760
    Abstract: Aqueous bonding agents based on at least one phenolic resin, at least one aromatic dinitroso compound and a polyvinyl alcohol are suitable as a one-coat aqueous rubber-metal bonding agent to achieve permanent rubber-metal bonds. These bonding agents can be substantially free from organic solvents and halogen compounds, and allow one-coat application without an additional, previous application of a primer.
    Type: Grant
    Filed: June 13, 2003
    Date of Patent: June 7, 2005
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Rainer Wefringhaus, Hans-Joachim Purps
  • Publication number: 20030232917
    Abstract: Aqueous bonding agents based on at least one phenolic resin, at least one aromatic dinitroso compound and a polyvinyl alcohol are suitable as a one-coat aqueous rubber-metal bonding agent to achieve permanent rubber-metal bonds. These bonding agents can be substantially free from organic solvents and halogen compounds, and allow one-coat application without an additional, previous application of a primer.
    Type: Application
    Filed: June 13, 2003
    Publication date: December 18, 2003
    Inventors: Rainer Wefringhaus, Hans-Joachim Purps
  • Patent number: 5491189
    Abstract: The adhesive strength of an aqueous binder dispersion consisting of: a halogenated copolymer which, in addition to other components, contains an alkylation-active monoalkenylaromatic alkyl halide; polyfunctional aromatic nitroso compounds; pigments; carbon black; anti-foaming agents; emulsifiers; and other additives, used for vulcanizing rubber onto substrates which are stable under the conditions of vulcanization, is improved, and the use of blocked isocyanates is avoided. This is achieved by adding, to increase the adhesive strength, homopolymers or copolymers of vinyl acetate that are also saponified to a certain extent, as well as, optionally, other customary additives.
    Type: Grant
    Filed: January 26, 1994
    Date of Patent: February 13, 1996
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Hans Scheer, Wolf-Dieter Beiersdorf, Hans-Joachim Purps