Patents by Inventor Harold (Hal) Ellis

Harold (Hal) Ellis 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).

  • Heating device containing electrically conductive composition
    Patent number: 3999040
    Abstract: An electrically conductive composition comprises a particulate, homogeneous blend of:A. about 60% to about 98% by weight of graphite;B. about 1.5% to about 20% by weight of manganese dioxide; andC. about 0.5% to about 20% by weight of zinc oxide, based on total weight of said blend. These compositions are suitable for the manufacture of coating compositions, heating elements and structures which are useful where radiant, conductive, or convective heating is required, and for other applications which utilize the sheet and volumetric electrical conductivity properties of the formulations made therefrom.
    Type: Grant
    Filed: July 8, 1975
    Date of Patent: December 21, 1976
    Assignee: Delphic Research Laboratories, Inc.
    Inventor: Harold (Hal) Ellis