Patents by Inventor Lisa A. Tietz

Lisa A. Tietz 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).

  • Dense barium crown optical glasses
    Patent number: 5371048
    Abstract: A dense barium crown glass consisting essentially of, as calculated in weight % on an oxide basis, 35-42% SiO.sub.2, 11-17% B.sub.2 O.sub.3, 5.5-7.7% Al.sub.2 O.sub.3, 35-42% BaO, 0.25-1.5% Li.sub.2 O. The glasses have a liquidus temperature bellow 900.degree. C. and a viscosity at the liquidus temperature that is greater than 1000 Pa.s (10,000 poises).
    Type: Grant
    Filed: October 18, 1993
    Date of Patent: December 6, 1994
    Assignee: Corning Incorporated
    Inventor: Lisa A. Tietz
  • Lead-free fine crystal glassware
    Patent number: 5270269
    Abstract: This invention relates to fine glass crystal prepared from lead-free glass compositions. The glasses consist essentially, in weight percent, of______________________________________ SiO.sub.2 54-64 BaO 8-13 Li.sub.2 O 0-3 SrO 8-13 Na.sub.2 O 0-6.5 ZnO 5.5-9 K.sub.2 O 0-7 BaO + SrO + ZnO 22-33 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 8-15 ______________________________________wherein at least two of Li.sub.2 O, Na.sub.2 O, and K.sub.2 O are present and are present in essentially equimolar ratios.
    Type: Grant
    Filed: June 8, 1992
    Date of Patent: December 14, 1993
    Assignee: Corning Incorporated
    Inventors: George B. Hares, Roger A. Miller, Lisa A. Tietz