Patents by Inventor Erwin Bacher

Erwin Bacher 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: 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