Patents by Inventor Wilhelmus M. M. Roovers

Wilhelmus M. M. Roovers 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 composed of an aromatic polycarbonate, optionally a polyalkyleneterephthalate and a graft copolymer
    Patent number: 5367021
    Abstract: The invention relates to a polymer mixture comprisingA) 55-90% by weight of an aromatic polycarbonate (A1) or a mixture of an aromatic polycarbonate (A1) and a polyalkylene terephthalate (A2);B) 10-30% by weight of a graft copolymer built up from a diene rubber graft base on which at least one of the following vinyl monomers has been grafted: styrene, acrylonitrile, methyl methacrylate;C) 0-15% by weight of a copolymer of styrene, alphamethyl styrene, methyl methacrylate or mixtures thereof and acrylonitrile, methacrylonitrile, methyl methacry late or mixtures thereof, the percentages by weight being calculated with respect to the sum of the constituents A, B and C, the diene rubber graft base having a monodisperse particle size distribution having such a narrow particle size distribution that the diameter of more than 50% by weight of the particles lies between 200 and 300 nanometers and the diameter of more than 70% by weight of the particles lies between 200 and 400 nanometers.
    Type: Grant
    Filed: January 11, 1994
    Date of Patent: November 22, 1994
    Assignee: General Electric Company
    Inventors: Wilhelmus M. M. Roovers, Wilhelmus J. D. Steendam
  • Polymer mixture which comprises polyphenylene ether, polyoctenylene and TiO.sub.2 or BaSO.sub.4
    Patent number: 5166249
    Abstract: The invention relates to polymer mixtures which comprise a polyphenylene ether, a polyoctenylene and TiO.sub.2 or BaSO.sub.4. The presence of TiO.sub.2 or BaSO.sub.4 leads to an improvement of the mechanical properties.
    Type: Grant
    Filed: April 9, 1991
    Date of Patent: November 24, 1992
    Assignee: General Electric Co.
    Inventors: Theodorus L. Hoeks, Christian M. E. Bailly, Johannes H. G. M. Lohmeijer, Wilhelmus M. M. Roovers
  • Polymer mixture comprising an aromatic polycarbonate, an aromatic polyester and an inorganic sulfur compound
    Patent number: 4965308
    Abstract: The invention relates to polymer mixtures which comprise an aromatic polycarbonate and an aromatic polyester. The polymer mixtures are stabilized by the addition of a sulphurous compound.
    Type: Grant
    Filed: May 25, 1988
    Date of Patent: October 23, 1990
    Assignee: General Electric Company
    Inventors: Wilhelmus M. M. Roovers, Jeroen J. Verhoeven
  • Polymer mixture comprising polybutylene terephthalate, aromatic polycarbonate and polydialkysiloxane
    Patent number: 4942188
    Abstract: The invention relates to polymer mixtures which comprise a polybutylene terephthalate, an aromatic polycarbonate, and a dialkyl silicone fluid. Due to the presence of the dialkyl silicone fluid compound a good lacquer bonding is obtained.
    Type: Grant
    Filed: November 9, 1988
    Date of Patent: July 17, 1990
    Assignee: General Electric Company
    Inventors: Wilhelmus Jozefus L. A. Hamersma, Jan de Boer, Wilhelmus M. M. Roovers, Gerrit de Wit