Patents by Inventor Christian Zumwald

Christian Zumwald 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).

  • Hydroxyphenyltriazines
    Patent number: 6117997
    Abstract: A description is given of compounds of the formula wherein R and R' independently are H, methyl or ethyl.The novel compounds are effective as stabilizers for organic material against the damaging effect of light, oxygen and heat; they are also suitable for use in skin or hair protection preparations.
    Type: Grant
    Filed: May 17, 1999
    Date of Patent: September 12, 2000
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Christophe Bulliard, Thomas Schafer, Christian Zumwald