Patents by Inventor Phillip A. Mellinger

Phillip A. Mellinger 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).

  • Self-limiting set screw for use with spinal implant systems
    Patent number: 5697929
    Abstract: The invention relates to a set screw having a self-limiting external torque head. The head has a hexagonal external cross-section and an internal bore which extends through a necked portion. The necked portion joins the external torque head to the threaded screw portion of the set screw. The necked portion has a cross-sectional thickness and strength to provide for shearing at a predetermined load limit, such as from about 54 to about 64 pounds per inch. The threaded screw portion has an internal hex to allow for the internal application of loosening torque at about two-thirds of the tightening torque limit, i.e., to provide a loosening torque of about 40 inch-pounds. The screw member includes a high-compression, rod-contacting surface such as a knurled surface.
    Type: Grant
    Filed: October 18, 1995
    Date of Patent: December 16, 1997
    Assignee: Cross Medical Products, Inc.
    Inventor: Phillip A. Mellinger