Patents by Inventor David G. Krashkevich

David G. 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).

  • Interference filter having a glass substrate
    Patent number: 6825142
    Abstract: The present invention generally relates to an interference filter including a glass substrate, useful in fiber optic systems.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: November 30, 2004
    Assignee: Schott Glass Technologies, Inc.
    Inventors: Sally Pucilowski, David G. Krashkevich
  • Interference filter having a glass substrate
    Publication number: 20030092559
    Abstract: The present invention generally relates to an interference filter including a glass substrate, useful in fiber optic systems.
    Type: Application
    Filed: January 7, 2002
    Publication date: May 15, 2003
    Inventors: Sally Pucilowski, David G. Krashkevich
  • Brown contrast enhancement glass
    Patent number: 5446007
    Abstract: A brown chemstrengthenable contrast enhancement, UV attenuated glass (e.g., for sunglasses) comprises, in weight percent,______________________________________ Oxide Wt. % ______________________________________ SiO.sub.2 40-72 B.sub.2 O.sub.3 0-13 Al.sub.2 O.sub.3 0.5-3 Li.sub.2 O 0-3 Na.sub.2 O 8-15 K.sub.2 O 1-10 TiO.sub.2 4.2-10.2 CeO.sub.2 0.5-3.5 Nd.sub.2 O.sub.3 5.0-16.5 Fe.sub.2 O.sub.3 2.5-4.0 CoO 0.00-0.02 NiO 0.06-0.33 ZnO 0.0-7.0 Er.sub.2 O.sub.3 0-2 Cr.sub.2 O.sub.3 0.0-0.2 V.sub.2 O.sub.5 0.0-0.2 CuO 0.00-0.10 MnO.sub.2 0.0-2.0 having the following properties: % T.sub.v,c (1.8 mm) 14-30 a -0.1 to +6.0 b +18.0 to +26.0 % T (380 nm; 1.8 mm) 0.0 % T (400 nm; 1.8 mm) .ltoreq.1.5 ______________________________________meeting the D.sub.6500 (1.8 mm) and Traffic Signal (1.8 mm) specifications of ANSI Z80.3-1986, and wherein the amount of Fe.sup.+2 in the glass is selected sufficiently low that said "a" and Traffic Signal properties are achieved.
    Type: Grant
    Filed: May 10, 1994
    Date of Patent: August 29, 1995
    Assignee: Schott Glass Technologies, Inc.
    Inventors: David G. Krashkevich, Sally Pucilowski
  • Vanadium- and copper-containing glasses for use as filters for light sources intended for use with night vision devices
    Patent number: 5234871
    Abstract: The invention relates to a glass consisting essentially of______________________________________ P.sub.2 O.sub.5 43-59 SiO.sub.2 0-9 Al.sub.2 O.sub.3 7-11 Li.sub.2 O 0-15 Na.sub.2 O 0-15 K.sub.2 O 0-15 MgO 0-15 CaO 0-0.5 BaO 0-7 ZnO 0-7 CeO.sub.2 0-0.5 CuO 7-21 V.sub.2 O.sub.5 0.07-0.7 Pr.sub.6 O.sub.11 0-1.5 Nd.sub.2 O.sub.3 0-1.5 Nb.sub.2 O.sub.5 0-3 B.sub.2 O.sub.3 0-3 Y.sub.2 O.sub.3 0-3 Cr.sub.2 O.sub.3 0-1 ______________________________________having a photopic transmission of at least 10% at full rated voltage and a color space of NVIS Green A or B. The glass is useful in the production of optical filters for use with light sources in order to render said sources compatible with night vision imaging systems.
    Type: Grant
    Filed: November 27, 1991
    Date of Patent: August 10, 1993
    Assignee: Schott Glass Technologies, Inc.
    Inventor: David G. Krashkevich
  • Contrast enhancement in glass
    Patent number: 5190896
    Abstract: A colored, chemstrengthenable contrast enhancement, UV attenuated glass (e.g., for sunglasses) comprises, in weight percent,______________________________________ Oxide Wt. % ______________________________________ SiO.sub.2 40-72 B.sub.2 O.sub.3 0-13 Al.sub.2 O.sub.3 0.5-3 Li.sub.2 O 0-3 Na.sub.2 O 8-13 K.sub.2 O 1-10 TiO.sub.2 8.0-9.5 CeO.sub.2 2.6-3.5 Nd.sub.2 O.sub.3 5-17 Fe.sub.2 O.sub.3 1.40-2.10 CoO 0-0.07 NiO 0-0.4 CuO 0-0.5 Er.sub.2 O.sub.3 0-2 V.sub.2 O.sub.5 0-0.5 Cr.sub.2 O.sub.3 0-0.25 ______________________________________and has the following properties% T (2.0 mm) 400 nm: .ltoreq.2.2%% T (2.0 mm) 380 nm: 0.0%a: -1.0 to -7.5b: +1.0 to +10.0.
    Type: Grant
    Filed: June 25, 1992
    Date of Patent: March 2, 1993
    Assignee: Schott Glass Technologies, Inc.
    Inventors: Sally Pucilowski, David G. Krashkevich, Ronald A. Klimek
  • Fiber optic core glass compositions having a high refractive index
    Patent number: 4932752
    Abstract: Glass fiber cores having a glass composition:______________________________________ Compositional Oxide Range in wt % ______________________________________ SiO.sub.2 25-35 BaO 6-15 K.sub.2 O 1-6 Na.sub.2 O 0-4 La.sub.2 O.sub.3 0-10 Nb.sub.2 O.sub.5 4-12 PbO 10-50 TiO.sub.2 0-4.
    Type: Grant
    Filed: June 5, 1989
    Date of Patent: June 12, 1990
    Assignee: Schott Glass Technologies, Inc.
    Inventors: David G. Krashkevich, Monika J. Liepmann, Jon M. Melvin