Patents by Inventor William Michael Riggin

William Michael Riggin 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).

  • Pigment for rotogravure paper
    Publication number: 20020161097
    Abstract: A mixture of bulked delaminated kaolin and calcined kaolin is used without addition of or substantial reduction in dosage of a titania pigment in a coating for rotogravure paper.
    Type: Application
    Filed: February 23, 2001
    Publication date: October 31, 2002
    Inventors: John Hen, William Michael Riggin