Patents by Inventor Cordell E. Johnson

Cordell E. Johnson 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).

  • Iron blue nacreous coated pigments
    Patent number: 4047969
    Abstract: By addition of ferric ions to a ferrocyanide solution and adjustment of the pH, Iron Blue is directly precipitated and adheres to a mica or metal oxide coated mica substrate.
    Type: Grant
    Filed: October 5, 1976
    Date of Patent: September 13, 1977
    Assignee: The Mearl Corporation
    Inventors: Louis Armanini, Cordell E. Johnson