Patents by Inventor David Krashkevich

David Krashkevich 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).

  • Strengthenable, high neodymium-containing glasses
    Patent number: 5077240
    Abstract: A strengthened high NdO.sub.3 -containing glass has the composition of, in weight percent______________________________________ SiO.sub.2 40-60 Nd.sub.2 O.sub.3 10-30 As.sub.2 O.sub.3 /Sb.sub.2 O.sub.3 0-1 B.sub.2 O.sub.3 5.15 Na.sub.2 O 3-18 ZnO 0.1-10 Li.sub.2 O 0-3 K.sub.2 O 0-3 Al.sub.2 O.sub.3 0-7 PbO 0-15 MgO 0-3 CaO 0-3 BaO 0-3 SrO 0-3 .SIGMA.V.sub.2 O.sub.5, Cr.sub.2 O.sub.3, Mn.sub.2 O.sub.3 0-7 Fe.sub.2 O.sub.3, CoO, NiO, CuO TiO.sub.2 0-5 Pr.sub.6 O.sub.11 0-1.
    Type: Grant
    Filed: January 11, 1990
    Date of Patent: December 31, 1991
    Assignee: Schott Glass Technologies, Inc.
    Inventors: Yuiko Hayden, David Krashkevich
  • Contrast enhancement filter glass useful for color CRT displays
    Patent number: 5061659
    Abstract: A colored contrast enhancement glass comprises, in wt. %:______________________________________ SiO.sub.2 40-60 B.sub.2 O.sub.3 0-6 Al.sub.2 O.sub.3 0-2 .SIGMA.Li.sub.2 O, Na.sub.2 O, K.sub.2 O = R.sub.2 O 24-30 .SIGMA.MgO, CaO, SrO, ZnO, BaO = RO 0-10 TiO.sub.2 1-3.5 CeO.sub.2 1-3.5 Nd.sub.2 O.sub.3 4-12 La.sub.2 O.sub.3 1-11 MnO.sub.2 0.1-1.0 Er.sub.2 O.sub.3 (when included) 0.2-1.0 CuO 0.1-0.5 CoO 0.0005-0.0040 V.sub.2 O.sub.5 0.05-0.50 Cr.sub.2 O.sub.3 (when included) 0.0005-0.0300 Photopic % T 12-24 % T @ 445 nm 20-30 % T @ 555 nm 26-36 % T @ 580 nm 0-3 % T @ 618 nm 23-35 % T @ 620 nm 23-34 ______________________________________having color properties corresponding to values of (x,y) of the larger quadrangle of FIG. 1.
    Type: Grant
    Filed: August 7, 1990
    Date of Patent: October 29, 1991
    Assignee: Schott Glass Technologies, Inc.
    Inventors: Sally Ciolek, David Krashkevich
  • UV attenuated colored glasses
    Patent number: 5059561
    Abstract: Glasses containing chromophores are partially struck to produce no coloring or only light coloring due to the chromophore. The glasses are colored as desired by contents of colorant ions.
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: October 22, 1991
    Assignee: Schott Glass Technologies, Inc.
    Inventors: Sally Ciolek, David Krashkevich
  • Strengthenable, high non-nd lanthanoid-containing glasses
    Patent number: 5039631
    Abstract: A strengthened high lanthanide-containing glass has the composition of, in mole percent______________________________________ SiO.sub.2 54-75 B.sub.2 O.sub.3 5-17 Li.sub.2 O 0-4 Na.sub.2 O 3-18 K.sub.2 O 0-4 Al.sub.2 O.sub.3 0-7 PbO 0-4 MgO 0-3 CaO 0-3 SrO 0-3 BaO 0-3 ZnO 0.1-10 TiO.sub.2 0-5 Ln.sub.2 O.sub.3 3-7 V.sub.2 O.sub.5 + Cr.sub.2 O.sub.3 + Mn.sub.2 O.sub.3 0-5 Fe.sub.2 O.sub.3 + CoO + NiO + CuO As.sub.2 O.sub.3 /Sb.sub.2 O.sub.3 0-0.4 ______________________________________wherein Ln is La, Ce, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and/or Yb.
    Type: Grant
    Filed: January 11, 1990
    Date of Patent: August 13, 1991
    Assignee: Schott Glass Technologies, Inc.
    Inventors: David Krashkevich, Yuiko T. Hayden