Patents by Inventor Fernando Del Pino

Fernando Del Pino 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).

  • Liquid crystal display element
    Patent number: 4398803
    Abstract: Liquid crystal display elements based on a twisted nematic cell are almost free from interference colors and show only a very little angular dependence of the contrast, if the product of the layer thickness and the optical anisotropy of the liquid crystalline dielectric has a value of 150 to 600 nanometers.
    Type: Grant
    Filed: June 15, 1981
    Date of Patent: August 16, 1983
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Ludwig Pohl, Rudolf Eidenschink, Fernando del Pino, Georg Weber
  • Liquid crystalline, partially hydrogenated oligo-1,4-phenylenes and dielectrics and electro-optical display elements containing them
    Patent number: 4331552
    Abstract: Partially hydrogenated oligo-1,4-phenylenes of the formula ##STR1## wherein n is 1 or 2, the rings A and B are identical or different and are trans-4-alkylcyclohexyl or 4-alkylcyclohex-1-enyl, and the alkyl groups in each case are of up to 10 carbon atoms, have valuable liquid crystalline properties.
    Type: Grant
    Filed: December 5, 1980
    Date of Patent: May 25, 1982
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Rudolf Eidenschink, Ludwig Pohl, Michael Romer, Fernando del Pino
  • Liquid-crystalline dielectric
    Patent number: 4285829
    Abstract: A liquid-crystalline dielectric having a positive dielectric anisotropy comprises a biphenyl derivative of the formula ##STR1## wherein R.sub.1 is alkyl of 1-4 C atoms or alkoxy of 1-3 C atoms, and a phenylcyclohexane derivative of the formula ##STR2## wherein R.sub.2 is alkyl of 1-4 C atoms, in a weight ratio of 3:1 to 1:3.
    Type: Grant
    Filed: July 20, 1979
    Date of Patent: August 25, 1981
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Rudolf Eidenschink, Ludwig Pohl, Georg Weber, Fernando Del Pino
  • Biphenyl esters and liquid crystalline mixtures comprising them
    Patent number: 4136053
    Abstract: Biphenyl esters of the formula ##STR1## wherein X is --CO--O-- or --O--CO-- and R.sub.1 and R.sub.2 each are alkyl or alkoxy of 1 - 8 carbon atoms, enlarge significantly the temperature range of the nematic phase of liquid-crystalline compositions without adversely affecting other properties.
    Type: Grant
    Filed: October 11, 1977
    Date of Patent: January 23, 1979
    Assignee: Merck Patent Gesellschaft mit beschankter Haftung
    Inventors: Rolf Steinstrasser, Fernando DEL Pino
  • Liquid crystalline materials of reduced viscosity
    Patent number: 4118335
    Abstract: Biphenyl derivatives of the formula ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and are straight-chain alkyl of 2 - 12 carbon atoms and collectively have at least 5 carbon atoms, are added to known liquid crystalline materials to significantly lower the viscosity thereof.
    Type: Grant
    Filed: October 8, 1976
    Date of Patent: October 3, 1978
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Joachim Krause, Ralf Streinstrasser, Ludwig Pohl, Fernando Del Pino, Georg Weber
  • Liquid crystalline dielectric composition
    Patent number: 4077900
    Abstract: A liquid crystalline dielectric composition contains 0.001-5% by weight of a monocyclic or bicyclic amino compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 each are hydrogen or collectively are CH.sub.2 --(CH.sub.2 --Z--CH.sub.2).sub.p --CH.sub.2 ; X is --CH.sub.2 or --CO--; Y is --Z--CH.sub.2 --CH.sub.2 -- or ##STR2## Z is O, S, or NH; m and n are 0, 1 or 2; p is 1, 2 OR 3; OR AN ACID ADDITION SALT OR METAL SALT CHELATE COMPLEX THEREOF.
    Type: Grant
    Filed: March 8, 1977
    Date of Patent: March 7, 1978
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Ludwig Pohl, Rainer Klink, Joachim Krause, Rudolf Eidenschink, Fernando Del Pino
  • Biphenyl esters and liquid crystalline mixtures comprising them
    Patent number: 4065489
    Abstract: Biphenyl esters of the formula ##STR1## wherein X is --CO--O-- or --O--CO-- and R.sub.1 and R.sub.2 each are alkyl or alkoxy of 1 - 8 carbon atoms, enlarge significantly the temperature range of the nematic phase of liquid-crystalline compositions without adversely affecting other properties.
    Type: Grant
    Filed: October 21, 1975
    Date of Patent: December 27, 1977
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Rolf Steinstrasser, Fernando Del Pino