Patents by Inventor Karl-Joef Herd

Karl-Joef Herd 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).

  • Pyridone dyestuffs
    Patent number: 5359041
    Abstract: Dyestuffs of the formula ##STR1## in which the substituents have the meaning given in the description, are suitable for the dyeing and printing of, for example, cellulose and polyamides.
    Type: Grant
    Filed: July 1, 1992
    Date of Patent: October 25, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfram Reddig, Karl-Joef Herd