Patents by Inventor Siegbert Arnold

Siegbert Arnold 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 a substituted 2-amino-1-sulphonaphthalene
    Patent number: 5502173
    Abstract: 2,4,6-trifluoro-5-chloro-pyrimidine and the aqueous solution of a salt of 2-amino-5-aminomethyl-naphthalene-1-sulphonic acid are simultaneously metered into a reactor in approximately equimolar amounts and afford a valuable intermediate for the preparation of high-purity dyes.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: March 26, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Horst Ja/ ger, Siegbert Arnold, Richard Sommer
  • Process for the continuous reaction of halogenopyrimidines with amines
    Patent number: 5420255
    Abstract: A process for the continuous reaction of halogenopyrimidines with amines, a halogenopyrimidine and an aqueous amine solution or suspension being passed into a reactor and the reaction product being subsequently conducted away, is described, characterized in that the starting materials are introduced into the reactor simultaneously and continuously with intensive mixing.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: May 30, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Siegbert Arnold, Hans-Georg Frosch, Manfred Hoppe, Wolfgang Mullers, Richard Sommer
  • Process for the continuous reaction of difluorotriazinyl compounds with amines
    Patent number: 5332813
    Abstract: Difluorotriazinyl compounds of the formula ##STR1## are continuously reacted in a reactor with amines in solution or suspension.
    Type: Grant
    Filed: November 3, 1992
    Date of Patent: July 26, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Hoppe, Wolfgang Mullers, Hans-Georg Frosch, Richard Sommer, Siegbert Arnold, Wolfram Reddig