Patents by Inventor Theodorus J. G. Zwartkruis

Theodorus J. G. Zwartkruis 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: 8138245
    Abstract: The invention relates to a halogen free flame retardant polyester composition suitable for use as a molding composition for making lampholders, comprising (A) a polymeric material consisting for at least 50 wt. %, relative to the total weight of the polymeric material, of a thermoplastic polyester; (B) a flame retardant system in an amount of 11-35 wt. %, relative to the total weight of (A), (B) and (C), and consists of: melamine cyanurate, and optionally one or more of the following flame retardant components: another phosphorus-free nitrogen based organic flame retardant compound, a phosphorus containing flame retardant excluding elementary phosphorus, in an amount of less than 1 wt. %, relative to the total weight of (A), (B) and (C); an inorganic flame retardant synergist, and an organic flame retardant synergist (C) a fibrous reinforcing agent in an amount of 5-35 wt. %, relative to the total weight of (A), (B) and (C); and (D) a mould release agent in an amount of at least 0.01 wt.
    Type: Grant
    Filed: April 2, 2007
    Date of Patent: March 20, 2012
    Assignee: DSM IP Assets B.V.
    Inventors: Ronald M. A. M. Schellekens, Robert H. C. Janssen, Theodorus J. G. Zwartkruis, Franciscus Vehmendahl Van
  • Publication number: 20090264562
    Abstract: The invention relates to a halogen free flame retardant polyester composition suitable for use as a moulding composition for making lampholders, comprising (A) a polymeric material consisting for at least 50 wt. %, relative to the total weight of the polymeric material, of a thermoplastic polyester; (B) a flame retardant system in an amount of 11-35 wt. %, relative to the total weight of (A), (B) and (C), and consists of: melamine cyanurate, and optionally one or more of the following flame retardant components: another phosphorus-free nitrogen based organic flame retardant compound, a phosphorus containing flame retardant excluding elementary phosphorus, in an amount of less than 1 wt. %, relative to the total weight of (A), (B) and (C); an inorganic flame retardant synergist, and an organic flame retardant synergist (C) a fibrous reinforcing agent in an amount of 5-35 wt. %, relative to the total weight of (A), (B) and (C); and (D) a mould release agent in an amount of at least 0.01 wt.
    Type: Application
    Filed: April 2, 2007
    Publication date: October 22, 2009
    Applicant: DSM IP ASSETS B.V.
    Inventors: Ronald M.A.M Schellekens, Robert H.C. Janssen, Theodorus J.G. Zwartkruis, Franciscus Vehmendahl Van
  • Publication number: 20090105381
    Abstract: The invention relates to A polyester moulding composition consisting of (A) 100 parts by weight (pbw) of a polymer composition consisting of (A-i) at least 50 pbw of a thermoplastic polyester, and, optionally, (A-ii) at least one other polymer, (B) between 2 and 40 pbw of a flame retardant system consisting of (B-i) a nitrogen based organic flame retardant compound free of phosphorus or a phosphorus free salt thereof, and, optionally, (B-ii) less than 1 pbw of a phosphorus containing flame retardant compound, (C) between 0.01 and 1 pbw of a mould release agent, and optionally (D) 0-10 pbw of a fibrous reinforcing agent, and (E) 0-100 pbw of other additives. The invention also relates to the use of the composition for making molded parts, in particular part for use in electrical or electronic applications, and to these molded parts.
    Type: Application
    Filed: April 21, 2006
    Publication date: April 23, 2009
    Inventors: Egbert W. Kuijk, Theodorus J.G. Zwartkruis, Robert H.C. Janssen