Patents by Inventor Hans P. Schad

Hans P. Schad 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).

  • Anisotropic compounds and liquid crystal mixtures therewith
    Patent number: 4710315
    Abstract: Anisotropic compounds of the formula (1) specified in claim 1 are suitable, owing to their low .DELTA..epsilon./.epsilon..perp. values for liquid crystal displays which have high information densities of for examples up to 10.sup.6 image dots and accordingly need to be highly multiplexible; compared with known compounds they offer improved application properties and are relatively simple to synthesize.
    Type: Grant
    Filed: December 16, 1985
    Date of Patent: December 1, 1987
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Hans P. Schad, Stephen M. Kelly
  • Anisotropic compounds and liquid crystal mixtures therewith
    Patent number: RE36849
    Abstract: Anisotropic compounds of the formula (1) specified in claim 1 are suitable, owing to their low .DELTA..epsilon./.epsilon..perp. values for liquid crystal displays which have high information densities of for examples up to 10.sup.6 image dots and accordingly need to be highly multiplexible; compared with known compounds they offer improved application properties and are relatively simple to synthesize.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: September 5, 2000
    Assignee: Merck Patent GmbH
    Inventors: Hans P. Schad, Stephen M. Kelly, Eike Poetsch, Reinhard Hittich, Georg Weber