Patents by Inventor Tamas Mallat

Tamas Mallat 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).

  • Continuous process for the enantioselective hydrogenation of alpha ketocarbonyl compounds
    Patent number: 6646135
    Abstract: The invention relates to a continuous process for enantioselective catalytic hydrogenation of an alpha ketocarbonyl compound such as alpha ketoesters and alpha ketolactones to produce an alpha hydroxy carbonyl compound.
    Type: Grant
    Filed: May 10, 2000
    Date of Patent: November 11, 2003
    Assignee: Roche Vitamins Inc.
    Inventors: Alfons Baiker, Niklaus Künzle, Tamas Mallat
  • Process for the preparation of amines
    Patent number: 6376713
    Abstract: A single-stage process is described for the preparation of primary aliphatic polyamines of the formula in which R1 and R2 independently of one another are hydrogen, methyl, ethyl or aminomethyl, by reaction of polyalcohols on a Co/Ni catalyst with supercritical ammonia in the presence of hydrogen.
    Type: Grant
    Filed: September 27, 2000
    Date of Patent: April 23, 2002
    Assignee: Lonza AG
    Inventors: Alfons Baiker, Achim Fischer, Tamas Mallat, Oleg Werbitzky
  • Method for producing cyclohexanediamines
    Patent number: 6369274
    Abstract: 1,n-cyclohexanediamines (n=2, 3, 4) of general formula (I), wherein one of the radicals R1 to R3 is an amino group and the two others mean hydrogen, are produced from the corresponding cyclohexanediols and ammonia in the presence of a catalyst containing cobalt, at 100° to 350° C. and 50 to 300 bar. The compounds that can be produced according to the invention are structural elements for polymers, especially polyamides, polyimides, polyurea or polyurethanes, and ligands for cytostatically effective transition metal complexes.
    Type: Grant
    Filed: July 20, 2001
    Date of Patent: April 9, 2002
    Assignee: Lonza AG
    Inventors: Alfons Baiker, Tamas Mallat, Achim Fischer