Patents by Inventor Kuno Schleich

Kuno Schleich 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).

  • Pyridazines
    Patent number: 4452718
    Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is straight-chain alkyl of 1 to 12 carbon atoms, R.sup.2 is alkyl, alkoxy, p-alkylphenyl, p-alkoxyphenyl or trans-4-alkylcyclohexyl, and the alkyl and alkoxy groups in R.sup.2 each are straight-chain groups of 1 to 10 carbon atoms,their manufacture, liquid crystalline mixtures containing said compounds as well as their use for electro-optical purposes are described. The novel compounds are valuable components for liquid crystalline mixtures and have a negative dielectric anisotropy.
    Type: Grant
    Filed: July 12, 1982
    Date of Patent: June 5, 1984
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Martin Schadt, Kuno Schleich, Georg Trickes
  • Decalins
    Patent number: 4432885
    Abstract: Decalins of the formula ##STR1## wherein ring A is aromatic or a trans-1,4-disubstituted cyclohexane ring; R.sup.2 is methyl, --CH.sub.2 R', --OR', --CO--R', --CN, --COOH, --CO--OR', --CO--SR' or --O--CO--R'; R.sup.1 is hydrogen, methyl, --CH.sub.2 R, --OR or --CH.sub.2 OR, or when R.sup.2 is methyl, --CH.sub.2 R', --OR' or --CO--R', R.sup.1 also can be --CN, --COOH, --CO--OR, --CO--SR or --O--CO--R; R and R' each are alkyl; and R.sup.1 and R.sup.2 each have up to 12 carbon atoms and together have at most 14 carbon atoms,their racemates and optically active antipodes, are described. Liquid crystalline mixtures comprising Compound I as well as their use in electro-optical devices also are disclosed.
    Type: Grant
    Filed: December 9, 1981
    Date of Patent: February 21, 1984
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Martin Petrzilka, Kuno Schleich
  • Novel vitamin A acetate process
    Patent number: 4254281
    Abstract: There is disclosed a novel process for the preparation of vitamin A acetate whereby .gamma.-acetoxy-tiglic aldehyde is reacted with the salt formed by the reaction of vinyl-.beta.-ionol, triphenylphosphine and an acid.
    Type: Grant
    Filed: July 25, 1979
    Date of Patent: March 3, 1981
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Kuno Schleich, Hansjorg Stoller
  • Manufacture of polyene compounds via a Wittig reaction in a two phase solvent system
    Patent number: 4081470
    Abstract: Polyene compounds such as vitamin A acetate are prepared by reacting triarylphosphonium salts with aldehydes in a two-phase aqueous-organic solvent system.
    Type: Grant
    Filed: August 4, 1976
    Date of Patent: March 28, 1978
    Assignee: Hoffman-La Roche Inc.
    Inventors: Kuno Schleich, Hansjorg Stoller