Zinc Containing Patents (Class 501/26)
  • Leadless glazes for whiteware
    Patent number: 4340645
    Abstract: The present invention is directed to ceramic frits for use in ceramic glazes and to the glazes themselves which when fired consist essentially of:______________________________________ Constituent % by Weight ______________________________________ Alkali (K.sub.2 O, Na.sub.2 O, Li.sub.2 O) 3.5 to 6.5 ZnO 6.0 to 12.5 CaO 6.0 to 12.0 MgO 0 to 0.7 BaO 0 to 5.0 SrO 1.7 to 4.0 B.sub.2 O.sub.3 2.0 to 6.0 Al.sub.2 O.sub.3 7.0 to 12.0 SiO.sub.2 53.0 to 61.0 ZrO.sub.2 0 to 8.
    Type: Grant
    Filed: May 11, 1981
    Date of Patent: July 20, 1982
    Assignee: Mobay Chemical Corporation
    Inventor: Eugene F. O'Conor
  • Starting mixture for a dielectric composition, screen printing paste having such a starting mixture, and product obtained
    Patent number: 4323652
    Abstract: Dielectric composition, screen printing paste having such a composition and products obtained.The invention describes a dielectric composition which may be used in particular as an insulating screen-printing paste, which is compatible with a copper-containing conductive screen-printed layer, the paste containing, dispersed in an organic vehicle, a mixture of ceramic phases, consisting essentially of zinc oxide and cobalt oxide, and a vitreous phase containing at least a glass which can be devitrified by dissolving the zinc oxide.
    Type: Grant
    Filed: March 14, 1980
    Date of Patent: April 6, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Hugues Baudry, Claude Morhaim, Dominique Bricout
  • Leadless glaze composition made with alkaline earth molybdenate
    Patent number: 4316963
    Abstract: A leadless glaze composition having properties that make lead oxide containing glazes so widely used as ceramic glazes. The glazes according to this invention are prepared to analyze more than about 0.53 to about 1.5 weight percent molybdenum trioxide with the source of the molybdenum trioxide either in the frit or as a mill addition being alkaline earth molybdenate, for example, calcium molybdenate (CaMoO.sub.4).
    Type: Grant
    Filed: February 6, 1981
    Date of Patent: February 23, 1982
    Assignee: The O. Hommel Company
    Inventors: Richard O. Hommel, David Klimas
  • Very low expansion sealing frits
    Patent number: 4315991
    Abstract: This invention is drawn to thermally devitrifiable sealing glasses capable of forming sound seals with glasses, glass-ceramics, and ceramics having coefficients of thermal expansion (0.degree.-300.degree. C.) between about 0.5-5.times.10.sup.-7 /.degree. C. In finely fritted form, the glasses can be sintered and crystallized in situ at about 900.degree.-1000.degree. C. The glasses consist essentially, expressed in weight percent on the oxide basis, of about 1-2% Li.sub.2 O, 0.7-1.5% MgO, 9-13% ZnO, 19-23% Al.sub.2 O.sub.3, 62-68% SiO.sub.2, and at least 1% K.sub.2 O+Rb.sub.2 O+Cs.sub.2 O in the indicated proportions of 0-3% K.sub.2 O, 0-4% Rb.sub.2 O, and 0-6% Cs.sub.2 O.
    Type: Grant
    Filed: December 19, 1980
    Date of Patent: February 16, 1982
    Assignee: Corning Glass Works
    Inventors: Henry E. Hagy, Francis W. Martin
  • Low-melting, lead-free ceramic frits
    Patent number: 4312951
    Abstract: Disclosed are various ceramic frits which have a unique combination of low solubility, low-melting temperature, and freedom from lead oxide. They are formed from selected compositions in the alkali--ZnO--Al.sub.2 O.sub.3 --B.sub.2 O.sub.3 --P.sub.2 O.sub.5 --SiO.sub.2 --TiO.sub.2 --F system.
    Type: Grant
    Filed: September 7, 1979
    Date of Patent: January 26, 1982
    Assignee: Mobay Chemical Corporation
    Inventor: Richard A. Eppler