Patents by Inventor Ralf Zerrer

Ralf Zerrer 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).

  • Polycondensates containing phosphinic or phosphonic acid groups and siloxane groups
    Patent number: 5492995
    Abstract: The present invention relates to polycondensates of the general formula I ##STR1## in which X stands, at least once, for a group of the formula VII ##STR2## and, at least once, a group of the formula VIII ##STR3## and the other variables are defined as indicated in claim 1, processes for their preparation and their use.
    Type: Grant
    Filed: February 6, 1995
    Date of Patent: February 20, 1996
    Assignee: Hoechst Aktiengsellschaft
    Inventors: Fritz Engelhardt, Karl-Heinz Keil, Jurgen Kuhlwein, Wilfried Schuler, Willi Steckelberg, Ralf Zerrer, Werner Antwerpen
  • Polycondensates containing polysiloxane groups
    Patent number: 5488123
    Abstract: The present invention relates to polycondensates of the general formula I ##STR1## in which ##STR2## and the other variables are defined as indicated in claim 1, processes for their preparation and their use.
    Type: Grant
    Filed: February 6, 1995
    Date of Patent: January 30, 1996
    Assignee: Cassella AG
    Inventors: Fritz Engelhardt, Jurgen Kuhlwein, Wilfried Schuler, Ralf Zerrer, Werner Antwerpen
  • Process for dyeing polyester and polyester-containing textile materials
    Patent number: 5425785
    Abstract: The present invention relates to a process for dyeing polyester or polyester-containing textile materials at pH 8 to pH 11 with one or more monoazo dyestuffs of the general formula I ##STR1## in which A, R and X.sup.1 to X.sup.3 are as defined in claim 1.
    Type: Grant
    Filed: August 17, 1994
    Date of Patent: June 20, 1995
    Assignee: Hoechst Mitsubishi Kasei Co.
    Inventors: Ulrich Buhler, Ralf Zerrer