Patents by Inventor Duane G. Heikkinen

Duane G. Heikkinen 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).

  • Fine-metal-particle-based magnetic recording medium of improved environmental stability
    Patent number: 4074012
    Abstract: Magnetic recording media having a magnetizable layer that comprises fine metal particles based on iron, cobalt, or nickel dispersed in a nonmagnetizable binder material have improved environmental stability because of the presence in the magnetizable layer of an organic compound that bears sterically unhindered aliphatic amine functionality.
    Type: Grant
    Filed: August 29, 1975
    Date of Patent: February 14, 1978
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Duane G. Heikkinen, Thomas M. Kanten