Patents by Inventor Karl Mennemann

Karl Mennemann 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 and ophthalmic glass with refractive indices nd>1.58, Abbe numbers>45 and densities<2.75 g/cm.sup.3
    Patent number: 4438211
    Abstract: A borosilicate glass composition suitable for use as an eyeglass lens, characterized by having a refractive index nd.gtoreq.1.58, an Abbe number vd.gtoreq.45, a density .rho..ltoreq.2.75 g/cm.sup.3, and an excellent aptitude for chemical hardening, consisting essentially of the following composition, in weight percent:______________________________________ SiO.sub.2 51-65 B.sub.2 O.sub.3 2-14 Al.sub.2 O.sub.3 0-5 SiO.sub.2 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 62-73 Li.sub.2 O 4-13 Na.sub.2 O 0-4 K.sub.2 O 0-4 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 7-15 CaO 1-19 MgO 0-11 CaO + MgO 6-22 TiO.sub.2 0-8 ZrO.sub.2 0-9.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: March 20, 1984
    Assignee: Schott Glaswerke
    Inventors: Karl Mennemann, Georg Gliemeroth, Volkmar Geiler
  • Acidproof, hydrolysis-resistant optical and ophathalmic glass of low density
    Patent number: 4400473
    Abstract: An improved optical glass having an index of refraction of .gtoreq.1.69, an Abbe number of .gtoreq.38, and a density of .ltoreq.3.25 g/cm.sup.3, represents a further development of another optical glass recently provided by the same inventors. The new glass has improved suitability for continuous-tank manufacture and increased acidproofness and differs from the other glass in its content of 0.5-4.0% by weight of P.sub.2 O.sub.5 ; its sum total of SiO.sub.2 +B.sub.2 O.sub.3 +Al.sub.2 O.sub.3 +P.sub.2 O.sub.5 being 38.5-41.5% by weight; and its sum total of MgO+CaO being 13-17.5% by weight. The full glass composition, e.g. is in % by weight:______________________________________ SiO.sub.2 26.0-32.5 B.sub.2 O.sub.3 6.0-12.0 Al.sub.2 O.sub.3 0-3.0 P.sub.2 O.sub.5 0.5-4.0 SiO.sub.2 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 + P.sub.2 O.sub.5 = 38.5-41.5 Li.sub.2 O 0-5 Na.sub.2 O 0-6 K.sub.2 O 0-8 Li.sub.2 O + Na.sub.2 O + K.sub.2 O = 4.5-12.0 MgO 0-8 CaO 9-16 MgO + CaO = 13-17.
    Type: Grant
    Filed: June 2, 1982
    Date of Patent: August 23, 1983
    Assignee: Schott Glaswerke
    Inventors: Karl Mennemann, Georg Gliemeroth, Volkmar Geiler
  • Acidproof, hydrolysis-resistant optical and ophthalmic glass of low density
    Patent number: 4390638
    Abstract: An optical and ophthalmic glass having an index of refraction of .gtoreq.1.69, an Abbe number of .gtoreq.37, and a density of .ltoreq.3.30 g/cm.sup.3, consists essentially of (in % by weight):______________________________________ SiO.sub.2 18-36 B.sub.2 O.sub.3 3-18 GeO.sub.2 0-8 Al.sub.2 O.sub.3 0-6, wherein SiO.sub.2 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 + GeO.sub.2 25-39 P.sub.2 O.sub.5 0-14, wherein SiO.sub.2 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 + GeO.sub.2 + P.sub.2 O.sub.5 = 30-44 Li.sub.2 O 0-12 Na.sub.2 O 0-14 K.sub.2 O 0-18 Li.sub.2 O + Na.sub.2 O + K.sub.2 O = 2-18 MgO 0-15 CaO 7-25 MgO + CaO 15-32 SrO 0-13 BaO 0-17 ZnO 0-15 PbO 0-10 SrO + BaO + ZnO + PbO 0-20 TiO.sub.2 3-14 Nb.sub.2 O.sub.5 0-13 WO.sub.3 0-10 TiO.sub.2 + Nb.sub.2 O.sub.5 + WO.sub.3 = 10-21 ZrO.sub.2 0-15, La.sub.2 O.sub.3 0-20 Y.sub.2 O.sub.3 0-16 Gd.sub.2 O.sub.3 0-16 Yb.sub.2 O.sub.3 0-10 La.sub.2 O.sub.3 + Y.sub.2 O.sub.3 + Gd.sub.2 O.sub.3 + Yb.sub.2 O.sub.3 = 0-20 Ta.sub.2 O.sub.5 0-13 HfO.sub.2 0-5 SnO.sub.2 0-6.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: June 28, 1983
    Assignee: Schott Glaswerke
    Inventors: Karl Mennemann, Georg Gliemeroth, Volkmar Geiler