Patents by Inventor Alwin Weitzel

Alwin Weitzel 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).

  • Barium-free, X-ray-opaque dental glass and dental glass/polymer composite, and the use thereof
    Patent number: 6297181
    Abstract: The invention relates to a barium-free, X-ray-opaque dental glass, to a dental glass/polymer composite comprising the glass, and to the use thereof as dental filling, where the dental glass has the following composition (in % by weight): SiO2 20-45, Al2O3 5-35, B2O3 1-10, Na2O 1-10, K2O 0-8, Cs2O 0-8, sum all alkali metal oxides 1-15, CaO 0-8, SrO 0-27, ZnO 2-20, ZrO2 2-10, P2O5 0-10, La2O3 0-10, F 2-20, the total content of B2O3, ZnO, ZrO2 and La2O3 is >20% by weight, and the refractive index nd of the dental glass is in the range from 1.47 to 1.70.
    Type: Grant
    Filed: October 27, 1999
    Date of Patent: October 2, 2001
    Assignee: Schott Glas
    Inventors: Christian Kunert, Susanne Kessler, Hartmut Paschke, Alwin Weitzel, Ute Wolfel
  • Copper(II) oxide-containing aluminophosphate glasses
    Patent number: 5750448
    Abstract: The invention relates to a copper(II) oxide-containing aluminophosphate glass having good chemical resistance, very good devitrification stability, high transmission at wavelengths in the range from 350 to 550 nm and a refractive index n.sub.d of from 1.52 to 1.54. The glass has the following composition (in % by weight, based on oxide): Al.sub.2 O.sub.3 4-9; P.sub.2 O.sub.5 67-75; BaO 0.5-6; CaO 0.1-1; MgO 0-4; SrO 0-1; ZnO 0.2-1; .SIGMA.BaO+CaO+MgO+SrO+ZnO 3.5-7; Na.sub.2 O 1.5-5; K.sub.2 O 2.5-3.5; Li.sub.2 O 0.5-5; .SIGMA.Na.sub.2 O+K.sub.2 O+Li.sub.2 O 5-13; SiO.sub.2 0-1; B.sub.2 O.sub.3 1-2.5; AS.sub.2 O.sub.3 0.1-0.5; Cl.sup.- 0-0.3; F.sup.- O-1.3; CeO.sub.2 0.2-0.4; CuO 1-6; with K.sub.G =.SIGMA.Al.sub.2 O.sub.3 +SiO.sub.2 +CeO.sub.2 /.SIGMA.P.sub.2 O.sub.5 +B.sub.2 O.sub.3 0.06-0.125.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: May 12, 1998
    Assignee: Schott Glaswerke
    Inventors: Danuta Grabowski, Uwe Kolberg, Alwin Weitzel, Magdalena Winkler-Trudewig