Patents by Inventor Theo Kop

Theo Kop 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).

  • Publication number: 20070278960
    Abstract: A highly dense transparent aluminum oxide (alumina) has a fine crystal size and is stabilized for use at temperatures of 800° C. or more. Structures thereof may be used in the lighting industry in, for example, an electric lamp having a discharge tube with a wall of such a ceramic. The alumina according to the invention is provided with an additive comprising an oxide of yttrium, erbium or lanthanum and has an average crystal size ?2 ?m, and a relative density higher than 99.95% with a real in-line transmission RIT ?30-50%, measured over an angular aperture of at most 0.50 at a sample thickness of 0.8 mm and with a single wave-length of light of, preferably, 645 nm.
    Type: Application
    Filed: July 30, 2007
    Publication date: December 6, 2007
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Michel van BRUGGEN, Theo KOP, Theodora KEURSTEN
  • Publication number: 20060169951
    Abstract: The invention relates to highly dense transparent aluminum oxide (alumina) and structures thereof for applications where, e.g. in the lighting industry, a fine crystal size has to be obtained and stabilized for use at temperatures of 800° C. or more. The invention also relates to an electric lamp having a discharge tube with a wall of such a ceramic. The alumina according to the invention is provided with an additive and has an average crystal size=2 ?m, and a relative density higher than 99.95% with a real in-line transmission RIT=30%, preferably >40% and more preferably >50%, measured over an angular aperture of at most 0.50 at a sample thickness of 0.8 mm and with a single wave-length of light ? of preferably 645 nm, and the additive comprises at least one of the substances from the group consisting of oxides of Mg, Y, Er and La.
    Type: Application
    Filed: June 25, 2003
    Publication date: August 3, 2006
    Applicant: Koninklijke Philips Electronics N.V.
    Inventors: Michel Van Bruggen, Theo Kop, Theodora Keursten
  • Publication number: 20050269582
    Abstract: A semiconductor light emitting device comprising a light emitting layer disposed between an n-type region and a p-type region is combined with a ceramic layer which is disposed in a path of light emitted by the light emitting layer. The ceramic layer is composed of or includes a wavelength converting material such as a phosphor. Luminescent ceramic layers according to embodiments of the invention may be more robust and less sensitive to temperature than prior art phosphor layers. In addition, luminescent ceramics may exhibit less scattering and may therefore increase the conversion efficiency over prior art phosphor layers.
    Type: Application
    Filed: June 3, 2004
    Publication date: December 8, 2005
    Inventors: Gerd Mueller, Regina Mueller-Mach, Michael Krames, Peter Schmidt, Hans-Helmut Bechtel, Joerg Meyer, Jan de Graaf, Theo Kop
  • Publication number: 20050248277
    Abstract: The present invention relates to highly dense translucent and transparent aluminium oxide components for applications, e.g. in the lighting industry, where a fine crystal size has to be obtained and stabilized for use at temperatures of 800° C. or more. Disclosed are high-strength polycrystalline alumina products which include 0.001-0.5 weight-% ZrO2 stabilizing a fine crystal size <2 ?m or, preferably, <1 ?m if used at temperatures of 800° C. or more. The microstructure exhibits an extremely high relative density enabling a high real in-line transmission >30% measured over an angular aperture of at most 0.5° at a sample thickness of 0.8 mm and with a monochromatic wavelength of light?, preferably, of 645 run.
    Type: Application
    Filed: July 2, 2003
    Publication date: November 10, 2005
    Applicant: Koninklijke Philips Electronics N.V.
    Inventors: Michel Van Bruggen, Rolf Apetz, Theo Kop