Patents by Inventor Detlef Szeymies

Detlef Szeymies 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 preparing dyes and/or brightener formulations
    Patent number: 6613104
    Abstract: The invention relates to optical brighteners that possess at least one free SO3H group and their use for whitening materials containing cellulose.
    Type: Grant
    Filed: January 10, 2001
    Date of Patent: September 2, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Zarges, Rolf Brockmann, Erwin Bacher, Detlef Szeymies
  • Process for preparing dyes and/or brightener formulations
    Publication number: 20010049851
    Abstract: Process for preparing formulations comprising dyes and/or brighteners which possess at least one free SO3H and/or COOH group, characterized in that an aqueous suspension comprising
    Type: Application
    Filed: January 10, 2001
    Publication date: December 13, 2001
    Inventors: Wolfgang Zarges, Rolf Brockmann, Erwin Bacher, Detlef Szeymies
  • Process for preparing dyes and/or brightener formulations
    Patent number: 6241786
    Abstract: This invention relates to a process for preparing formulations comprising dyes and/or brighteners which possess at least one free SO3H and/or COOH group, in which an aqueous suspension comprising a) dyes and/or brighteners which possess at least one free SO3H and/or COOH group and b) inorganic synthesis salts is desalinated using a microfiltration membrane having pore diameters of from 0.05 to 40 &mgr;m.
    Type: Grant
    Filed: September 20, 1999
    Date of Patent: June 5, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Zarges, Rolf Brockmann, Erwin Bacher, Detlef Szeymies
  • Process for the preparation of substituted 4,4'-diaminostilbene-2,2'-disulphonic acids
    Patent number: 6025490
    Abstract: A process for the preparation of compounds of the formula (I) ##STR1## wherein n represents 0-2;M represents H, alkali metal ion or optionally substituted ammonium ion; andX represents anilino, N- or N,N-alkylamino;by reaction of a compound of the formula (IV) ##STR2## with 2 molar equivalents of an amnine of the formula X--H, at a pH of 5-10, optionally in the presence of an acid-trapping agent which differs from X--H, wherein the compound of the formula (IV) is added to an aqueous reaction medium with a temperature of at least 40.degree. C. and the amine of the formula X--H and, optionally, the acid-trapping agent are added to the aqueous reaction medium independently of one another and/or during and/or after the addition of IV. The compounds of the formula I which are outstandingly suitable as optical brighteners.
    Type: Grant
    Filed: February 11, 1998
    Date of Patent: February 15, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ulrich Feldhues, Rolf Brockmann, Udo Eckstein, Detlef Szeymies
  • Process for the preparation of a concentrated aqueous reactive dyestuff solution
    Patent number: 4778603
    Abstract: Ultrafiltered solutions of the dyestuff of the formula ##STR1## (Me=cation) such as is obtained directly on synthesis, are distinguished by an increased tinctorial strength in pad-steam dyeing of cellulose fibres.
    Type: Grant
    Filed: January 22, 1988
    Date of Patent: October 18, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jochen Koll, Joachim Wolff, Detlef Szeymies