Patents by Inventor Rolf Schimpf

Rolf Schimpf 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 preparation of 2-aminobenzene-1,4-disulphonic acids and the new compound 6-chloro-2-aminobenzene-1,4-disulphonic acid
    Patent number: 5315036
    Abstract: The present invention relates to an improved preparation process for 2-aminobenzene-1,4-disulphonic acids and the new compound 6-chloro-2-aminobenzene-1,4-disulphonic acid.
    Type: Grant
    Filed: February 8, 1993
    Date of Patent: May 24, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Schimpf, Walter Horstmann
  • Process for preparing p-toluidine-2-sulphonic acid
    Patent number: 4717514
    Abstract: P-Toluidine-2-sulphonic acid (5-amino-2-methylbenzenesulphonic acid) is obtained in very pure form and virtually free of p-toluidine-3-sulphonic acid (2-amino-5-methylbenzenesulphonic acid) by reacting p-toluidine at 10.degree.-55.degree. C. with oleum in sulphuric acid. The molar ratio of SO.sub.3 to p-toluidine in this reaction is 1-3.0:1. The reaction mixture is worked up by pouring into water and filtering off the precipitated p-toluidine-2-sulphonic acid.
    Type: Grant
    Filed: April 4, 1986
    Date of Patent: January 5, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinz U. Blank, Herbert Emde, Rolf Schimpf
  • Process for the preparation of 2-methoxy-5-methylaniline-4-sulphonic acid
    Patent number: 4166069
    Abstract: A process for the preparation of 2-methoxy-5-methylaniline-4-sulphonic acid by contacting optionally acylated 2-methoxy-5-methylaniline with sulfuric acid or a mixture of sulfuric acid and oleum at an elevated temperature.
    Type: Grant
    Filed: February 27, 1978
    Date of Patent: August 28, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventor: Rolf Schimpf
  • Process for preparing free-flowing 2-nitro-4-acetylamino-anisole
    Patent number: 4139558
    Abstract: 2-Nitro-4-acetylamino-anisole is prepared directly in the form of a moist, free-flowing material by nitrating 4-acetylamino-anisole and then treating the reaction mixture with water at slightly elevated temperatures, e.g., 20-60.degree. C.
    Type: Grant
    Filed: March 3, 1977
    Date of Patent: February 13, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Stopp, Rolf Schimpf