Patents by Inventor Rolf Schlick

Rolf Schlick 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).

  • Preparation of imidazole-4(5)-monocarboxylic acids and their salts or betaines
    Patent number: 4672128
    Abstract: Imidazole-4(5)-monocarboxylic acids and their salts or betaines are prepared by reacting an imidazole with carbon dioxide and an alkali metal carbonate, an alkali metal bicarbonate and/or an alkali metal hydroxide at from 140.degree. to 230.degree. C. and under from 2 to 350 bar and, if desired, then reacting the product with an acid.The imidazole-4(5)-monocarboxylic acids which can be prepared by the process of the invention are useful starting materials for the preparation of dyes, crop protection agents and drugs.
    Type: Grant
    Filed: July 24, 1985
    Date of Patent: June 9, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Uwe Kempe, Toni Dockner, Rolf Schlick