Patents by Inventor Harry Robbins

Harry Robbins 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 sulfur-containing ferromagnetic chromium oxide
    Patent number: 4018690
    Abstract: Modified ferromagnetic chromium oxide having an intrinsic coercive force above 150 Oersteds, a Curie temperature lower than that of unmodified chromium dioxide, and a specific magnetization in the range of 50-110 emu/gm., is prepared by heating material containing chromium (III) and sulfur in a form to yield upon oxidation a ferromagnetic chromium oxide with substitutional sulfur enhancing its magnetic properties.
    Type: Grant
    Filed: April 9, 1975
    Date of Patent: April 19, 1977
    Assignee: Eastman Kodak Company
    Inventor: Harry Robbins