Patents by Inventor Eric F. Drake

Eric F. Drake 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).

  • Metal cutting tools utilizing gradient composites
    Patent number: 4368788
    Abstract: A rolling cutter drill bit is disclosed having cutters manufactured by powder metallurgy techniques, said cutters having gradient composite metallic structures in the cutting areas arranged to reduce or eliminate physical and metallic discontinuities and stress risers.
    Type: Grant
    Filed: September 10, 1980
    Date of Patent: January 18, 1983
    Assignee: Reed Rock Bit Company
    Inventor: Eric F. Drake