Patents by Inventor Pierre-Andre Mari

Pierre-Andre Mari 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).

  • Process for preparing hexaferrite particles
    Patent number: 5135733
    Abstract: The present invention concerns a process for preparing magnetic particles of barium or strontium hexaferrites exhibiting a good dispersibility and improved magnetic properties. The process involves coprecipitating an iron salt with a barium or strontium salt, filtering and neutralizing the resulting coprecipitate, and washing it with a solution of a barium or strontium salt having a concentration in the range of 2.times.10.sup.-3 0.2 M.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: August 4, 1992
    Assignee: Eastman Kodak Company
    Inventors: Jean-Christophe Robert, Pierre-Andre Mari