Patents by Inventor Carol A. Ziel

Carol A. Ziel 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).

  • Patent number: D325638
    Type: Grant
    Filed: July 10, 1989
    Date of Patent: April 21, 1992
    Assignee: Hach Company
    Inventors: Sharon S. Sloat, Carol A. Ziel