Patents by Inventor Norbert Wolfram Gehenn

Norbert Wolfram Gehenn 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).

  • Optical fibers made from multicomponent glass
    Patent number: 7072562
    Abstract: The stepped optical fiber has a core glass member and a surrounding cladding glass member. It has a high numerical aperture (NA)?0.50. The core glass member preferably has a zinc-containing composition including, in % by weight, SiO2, 42 to 53; ZnO, 16 to 38; PbO, 1 to 20; Na2O, <14; K2O, <12; with a sum of ZnO and PbO?30 and a sum of Na2O and K2O is ?2. The cladding glass composition, which is compatible with this core glass, includes, in percent by weight, SiO2, 60 to 72; B2O3, <20; Al2O3, <10; Na2O, <18; and K2O, <15. The resulting optical fiber has low attenuation, very neutral color transmission and low manufacturing costs. Other cladding glass compositions resulted in considerably poorer properties with too much crystallization at the core glass boundary layer. Environmentally-friendly, lead-free embodiments of the core glass were also prepared having even lower aperture values of ?0.48.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: July 4, 2006
    Assignee: Schott Glas
    Inventors: Ralf Domres, Norbert Wolfram Gehenn, Uwe Kolberg, Georg Krolla, Frank Thomas Lentes