Patents by Inventor Andre Escher

Andre Escher 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).

  • Process for the production of 2-halo-4,6-dialkoxy pyrimidines
    Patent number: 5378845
    Abstract: A process for the production of 2-halo-4,6-dialkoxypyrimidines of the general formula: ##STR1## starting from a propanediimidate or its salts. In the first stage, a propanediimidate or its salts of the general formula: ##STR2## is/are converted with cyanamide of the formula:H.sub.2 N--CN IIIin the presence of a base at a pH values above pH 7 into a cyanimidate of the general formula: ##STR3## The latter is then converted in the second stage with a hydrogen halide into the end product according to formula I.
    Type: Grant
    Filed: August 4, 1993
    Date of Patent: January 3, 1995
    Assignee: Lonza, Ltd.
    Inventors: Andre Escher, Felix Previdoli, Rene Imwinkelried
  • Process for the production of 4,6-dialkoxypyrimidines
    Patent number: 5276152
    Abstract: A process for the production of 4,6-dialkoxypyrimidines of the general formula: ##STR1## A propanediimidate of the general formula: ##STR2## is converted with an anhydride of the general formula: ##STR3## to provide the product.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: January 4, 1994
    Assignee: Lonza Ltd.
    Inventors: Andre Escher, Felix Previdoli
  • Process for the production of 2-substituted 4,6-dialkoxypyrimidines
    Patent number: 5266697
    Abstract: A process for the production of 2-substituted 4,6-dialkoxypyrimidines starting from a cyanimidate of the general formula: ##STR1## The cyanimidate is cyclized with a hydrogen halide to a halopyrimidine derivative of general formula: ##STR2## The latter is then converted either with a compound of the formula:M--R.sub.
    Type: Grant
    Filed: November 23, 1992
    Date of Patent: November 30, 1993
    Assignee: Lonza Ltd.
    Inventors: Andre Escher, Felix Previdoli