Patents by Inventor Peter Hirschfeld

Peter Hirschfeld 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).

  • Composition for dyeing and bleaching of human hair and process for its preparation
    Patent number: 6302920
    Abstract: A flowable pulverulent bleaching or dyeing composition for human hair with improved properties of use, particularly dustlessness and good miscibility with water or aqueous hydrogen peroxide solution, is obtained by addition, preferably by a melting or spraying process, of about 5% to about 30% by wt. of at least one wax compound having a melting point between about 40° C. and about 130° C., preferably a C12-C18-fatty acid mono- and (or) dialkanolamide, between about 40° C. and about 130° C. to a powder comprising at least one solid compound exerting bleaching activity upon application on human hair or at least one direct hair dye.
    Type: Grant
    Filed: November 1, 1999
    Date of Patent: October 16, 2001
    Assignee: Goldwell AG
    Inventors: Heribert Lorenz, Peter Hirschfeld, Walter Eberling