Patents by Inventor Hendrikus H. T. M. Ketels

Hendrikus H. T. M. Ketels 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).

  • Polymer mixture and articles formed therefrom
    Patent number: 5541244
    Abstract: The invention relates to polymer mixtures comprising a first polyalkylene phthalate and a second polyalkylene phthalate and/or a thermoplastic elastomer. Certain compounds, namely phosphates, have been found to be good transesterification inhibitors. An important advantage of the said inhibitors is that they do not condense, or hardly condense, to polyphosphates and that they do not negatively influence the impact strength of the polymer mixture.
    Type: Grant
    Filed: October 10, 1995
    Date of Patent: July 30, 1996
    Assignee: General Electric Company
    Inventors: Roelof van der Meer, Constantinus L. J. A. Verbraak, Jan W. Heuseveldt, Johannes van Helmond, Hendrikus H. T. M. Ketels
  • Polymer mixtures and articles formed therefrom
    Patent number: 5496880
    Abstract: The invention relates to polymer mixtures comprising a first polyalkylene phthalate, for example, polybutylene terephthalate, and a second polyalkylene phthalate and/or a thermoplastic elastomer and phosphorus compounds. It has been found that, with regard to the crystallisation behaviour, the addition of certain nucleating agents (namely talcum or carbon black) show a synergistic effect with certain phosporus compounds.
    Type: Grant
    Filed: May 9, 1994
    Date of Patent: March 5, 1996
    Assignee: General Electric Company
    Inventors: Jan W. Heuseveldt, Johannes van Helmond, Hendrikus H. T. M. Ketels