Patents by Inventor Klaus Peter Stahl

Klaus Peter Stahl 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).

  • Supertwist liquid crystal display
    Patent number: 6210760
    Abstract: Supertwist liquid crystal displays having very short switching times are obtained if the nematic liquid crystal mixture contains at least one component chosen from group A consisting of compounds of the formulae AI to AVI: wherein R1 and R2 in each case independently of one another are each R and R is alkyl having 1-12 C atoms, wherein one or two non-adjacent CH2 groups can also be replaced by —O—, —CH═CH—, —CO—, —O—CO— or —CO—O—, and up to four other components.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: April 3, 2001
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Georg Weber, Herbert Plach, Takamasa Oyama, Hiroki Yoshitake, Bernhard Scheuble, Reinhard Hittich, Hans Adolf Kurmeier, Eike Poetsch, Klaus Peter Stahl
  • Supertwist liquid crystal display
    Patent number: 5876626
    Abstract: Supertwist liquid crystal displays having very short switching times are obtained if the nematic liquid crystal mixture contains at least one component chosen from group A consisting of compounds of the formulae AI to AVI: ##STR1## wherein R.sup.1 and R.sup.2 in each case independently of one another are each R and R is alkyl having 1-12 C atoms, wherein one or two non-adjacent CH.sub.2 groups can also be replaced by --O--, --CH.dbd.CH--, --CO--, --O--CO-- or --CO--O--, and up to four other components.
    Type: Grant
    Filed: December 7, 1994
    Date of Patent: March 2, 1999
    Assignee: Merck patent Gesellschaft mit Beschrankter Haftung
    Inventors: Georg Weber, Herbert Plach, Takamasa Oyama, Hiroki Yoshitake, Bernhard Scheuble, Reinhard Hittich, Hans Adolf Kurmeier, Eike Poetsch, Klaus Peter Stahl
  • Supertwist liquid-crystal display
    Patent number: 5308538
    Abstract: Supertwist liquid-crystal displays having excellent properties are obtained using a nematic liquid-crystal mixture based on component A which contains one or more compounds of the formula IIa or IIb: ##STR1## on or more compounds of the formulae IIc to IIe: ##STR2## and one or more compounds of the formula IIf to IIh: and one or more compounds of the formula IIf to IIh: ##STR3## wherein R, R.sup.1, R.sup.2, L, Y, X and n are as defined herein.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: May 3, 1994
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Georg Weber, Joachim Ruger, Klaus-Peter Stahl, Martina Schmidt, Detlef Pauluth, Michael Romer