Patents by Inventor Ludwig Karl Rijkse

Ludwig Karl Rijkse 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).

  • Fluorinated powder coatings having improved gloss
    Patent number: 6221429
    Abstract: Pigmented powder coating products based on low melting point fluorine-based terpolymers, preferably on those made from a majority of vinylidene fluoride copolymerized with tetrafluoroethylene and hexafluoropropene, are capable of providing coatings with controllable gloss properties. The process for preparing coatings from the powders is essentially characterized by the selection of the temperature at which the desired gloss can be obtained, from low to high, without degradation of the mechanical properties.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: April 24, 2001
    Assignee: Fina Research, S.A.
    Inventors: Edwin Verwey, Ludwig Karl Rijkse, Michel Gillard
  • Preparing powder primer of thermoset binder and PVdF-compatible thermoplastic
    Patent number: 6037412
    Abstract: Powder compositions comprising about 5-15 wt % of PVdF-compatible thermoplastic resin, about 50-90 wt % of a thermosetting binder system, about 0-35 wt % of pigments and about 0-3 wt % of leveling agent are disclosed which are particularly suitable for use as primers with a later application of a pigmented PVdF-based top coating. Preferred compositions are based on an epoxy system containing about 8 wt % of PVdF or acrylic thermoplastic resin, 5-25 wt % of pigments and 0.7-1 wt % of leveling agent.
    Type: Grant
    Filed: July 14, 1999
    Date of Patent: March 14, 2000
    Assignee: Fina Research, S.A.
    Inventors: Ludwig Karl Rijkse, Willem Sietses, Michel Gillard
  • Powder primer of thermosetting binder and PVdF-compatible thermoplastic
    Patent number: 5932657
    Abstract: Powder compositions comprising about 5-15 wt % of PVdF-compatible thermoplastic resin, about 50-90 wt % of a thermosetting binder system, about 0-35 wt % of pigments and about 0-3 wt % of leveling agent are disclosed which are particularly suitable for use as primers with a later application of a pigmented PVdF-based top coating. Preferred compositions are based on an epoxy system containing about 8 wt % of PVdF or acrylic thermoplastic resin, 5-25 wt % of pigments and 0.7-1 wt % of leveling agent.
    Type: Grant
    Filed: July 21, 1994
    Date of Patent: August 3, 1999
    Assignee: Fina Research, S. A.
    Inventors: Ludwig Karl Rijkse, Willem Sietses, Michel Gillard