Patents by Inventor Sondra L. Rice

Sondra L. Rice 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).

  • Magnetic particle dispersions
    Patent number: 4280918
    Abstract: A magnetic dispersion is prepared by adjusting the pH of a mixture containing magnetic particles to a value which results in a positive electrostatic charge on the particles, while a mixture containing colloidal silica particles at the same pH results in negative electrostatic charges on the silica particles. Combining these mixtures causes the silica particles to coat and irreversibly bond to the magnetic particles resulting in better dispersion and less aggregation of the magnetic particles.
    Type: Grant
    Filed: March 10, 1980
    Date of Patent: July 28, 1981
    Assignee: International Business Machines Corporation
    Inventors: Andrew M. Homola, Sondra L. Rice