Patents by Inventor Johannes G. M. Nieuwkamp

Johannes G. M. Nieuwkamp 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).

  • Plastic article and process for the preparation thereof
    Patent number: 5824400
    Abstract: The present invention relates to a plastic article formed from several foamed thermoplastic elastomers, such as a thermoplastic polyolefin elastomer based on polypropylene and a vulcanized elastomer at least one of an elastomeric styrene/ethylene/butylene/styrene block copolymer, an elastomeric styrene/butadiene/styrene block copolymer, a thermoplastic elastomer based on polypropylene and an elastomeric styrene/ethylene/butylene/styrene block copolymer and a thermoplastic elastomer based on polypropylene and an elastomeric styrene/butadiene/styrene block copolymer. The present invention further provides plastic articles based on a blend of thermoplastic elastomers and thermoplastic elastomer olefins. The invention further provides a process for making these articles.
    Type: Grant
    Filed: January 25, 1996
    Date of Patent: October 20, 1998
    Assignee: DSM N.V.
    Inventors: Jordanis Petrakis, Wolfgang Hoge, Torsten Leenaerts, Marinus Alfenaar, Johannes G. M. Nieuwkamp
  • Process for the preparation of a 2-pyrrolidone
    Patent number: 4325872
    Abstract: An improved method for hydrogenating succinonitrile, optionally carrying substituents, to form 2-pyrrolidones, in the liquid phase in the presence of ammonia, using a fixed-bed catalyst wherein the catalyst may be regenerated by successively passing liquid ammonia at 75.degree.-130.degree. C., then hydrogen at 130.degree.-350.degree. C., and then liquid ammonia again at 75.degree.-130.degree. C. over the catalyst.
    Type: Grant
    Filed: December 22, 1980
    Date of Patent: April 20, 1982
    Assignee: Stamicarbon, B.V.
    Inventors: Peter J. N. Meyer, Johannes G. M. Nieuwkamp
  • Process for preparing 2-pyrrolidones
    Patent number: 4279820
    Abstract: 2-pyrrolidones are prepared by hydrogenating a succinonitrile in the liquid phase in the presence of ammonia by passing an ammoniacal solution of a succinonitrile over a fixed bed catalyst, particularly of the trickle-phase type, in which the catalyst is nickel on an alkaline support such as calcium hydroxide or calcium carbonate. Attractive yields are achieved without the expense of filtering off and separating used catalyst as in prior procedures.
    Type: Grant
    Filed: March 27, 1980
    Date of Patent: July 21, 1981
    Assignee: Stamicarbon B.V.
    Inventor: Johannes G. M. Nieuwkamp
  • Process for preparing 2-pyrrolidone
    Patent number: 4193925
    Abstract: An improved process for the preparation of 2-pyrrolidone by the liquid phase hydrogenation of succinonitrile in the presence of a hydrogenation catalyst and ammonia, whereafter the resulting hydrogenation product is hydrolyzed with water. A hydrogenation catalyst in the form of a fixed bed is used, and a liquid phase of succinonitrile and liquid ammonia is passed over the catalyst at a temperature of between 50.degree. and 130.degree. C.
    Type: Grant
    Filed: January 18, 1979
    Date of Patent: March 18, 1980
    Assignee: Stamicarbon, B.V.
    Inventors: Peter J. N. Meijer, Johannes G. M. Nieuwkamp