Patents by Inventor Joseph C. Leighton

Joseph C. Leighton 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).

  • Roof bit
    Patent number: 4492278
    Abstract: A cutter bit wherein the dust collection openings are formed diametrically opposite each other, on an axis transverse to the longitudinal central axis of the bit body, and at least partly in the tapered dust control surfaces. The junctions of the heel surfaces and dust control surfaces define a pair of crown lines being parallel to one another and in planes which intersect the carbide insert in oblique fashion.
    Type: Grant
    Filed: July 27, 1984
    Date of Patent: January 8, 1985
    Assignee: Hughes Tool Company
    Inventor: Joseph C. Leighton