Patents by Inventor Gerold Sprachmann

Gerold Sprachmann 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).

  • Luminescent glass composition
    Patent number: 10414686
    Abstract: The invention relates to faceted gemstones based on a luminescent glass composition that contains particular oxides of rare earth metals and thus enables the faceted gemstones to be identified, and to a process for identifying the gemstones.
    Type: Grant
    Filed: August 24, 2015
    Date of Patent: September 17, 2019
    Assignee: D. Swarovski KG
    Inventors: Roy Debbage, Rainer Haid, Helmut Judmaier, Johannes Maier, Florian Meissl, Gerold Sprachmann
  • Luminescent Glass Composition
    Publication number: 20170166474
    Abstract: The invention relates to faceted gemstones based on a luminescent glass composition that contains particular oxides of rare earth metals and thus enables the faceted gemstones to be identified, and to a process for identifying the gemstones.
    Type: Application
    Filed: August 24, 2015
    Publication date: June 15, 2017
    Inventors: Roy Debbage, Rainer Haid, Helmut Judmaier, Johannes Maier, Florian Meissl, Gerold Sprachmann
  • Lead- and barium-free crystal glass
    Patent number: 7202188
    Abstract: A lead- and barium-free crystal glass having a refractive index of at least 1.55, with in % by weight, more than 50% and less than 60% SiO2, more than 0.6% and less than 4% B2O3, less than 3% K2O, more than 12% and less than 15% Na2O, more than 4% and less than 11% CaO, more than 0.25% and less than 5% Al2O3, less than 2% MgO, and between 8 and 16% ZnO, with the proviso that the total content of the oxides of Pb, Ba and As is below 0.1%, the total content of the oxides of Ti and La is below 5% and the total content of the oxides of Nb, Ta, Yb, Y, W, Bi and Zr is below 5%, wherein at most 1% oxides of Nb, Ta and Yb respectively and 3% of the oxides of Y, W, Bi and Zr respectively are included.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: April 10, 2007
    Assignee: D. Swarovski & Co.
    Inventors: Gerold Sprachmann, Johannes Maier
  • LEAD- AND BARIUM-FREE CRYSTAL GLASS
    Publication number: 20070032367
    Abstract: A lead- and barium-free crystal glass having a refractive index of at least 1.55, with in % by weight, more than 50% and less than 60% SiO2, more than 0.6% and less than 4% B2O3, less than 3% K2O, more than 12% and less than 15% Na2O, more than 4% and less than 11% CaO, more than 0.25% and less than 5% Al2O3, less than 2% MgO, and between 8 and 16% ZnO, with the proviso that the total content of the oxides of Pb, Ba and As is below 0.1%, the total content of the oxides of Ti and La is below 5% and the total content of the oxides of Nb, Ta, Yb, Y, W, Bi and Zr is below 5%, wherein at most 1% oxides of Nb, Ta and Yb respectively and 3% of the oxides of Y, W, Bi and Zr respectively are included.
    Type: Application
    Filed: September 18, 2006
    Publication date: February 8, 2007
    Inventors: Gerold Sprachmann, Johannes Maier
  • Gem comprised of a glass based on silicon oxide and calcium oxide
    Patent number: 5559061
    Abstract: A glass composition substantially comprising silicon oxide, calcium oxide and aluminum oxide, and its use for producing gems.
    Type: Grant
    Filed: November 14, 1995
    Date of Patent: September 24, 1996
    Assignee: D. Swarovski & Co.
    Inventors: Norbert Bilek, Wolfgang Porcham, Michael Schlamadinger, Gerold Sprachmann