Patents by Inventor Conrad A. Barngrover

Conrad A. Barngrover 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).

  • Bumper for orthodontic brackets
    Patent number: 4950158
    Abstract: A preformed, elastomeric orthodontic ligature includes a molded protrusion or bumper portion integrally connected to an occlusal region of a ring portion of the ligature. When the ligature is connected to a bracket, the bumper portion extends over occlusal surfaces of the bracket including an occlusal tie wing in order to prevent direct contact of the bracket with an opposing tooth. In preferred embodiments, the bumper portion is connected to the ring portion by a thin web which is configured to enable the ring portion to firmly seat under the tie wing and also enables the bumper portion to conform to the occlusal surfaces of the bracket such that the ring portion does not normally stretch and disengage the tie wings during mastication.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: August 21, 1990
    Assignee: Unitek Corporation
    Inventors: Conrad A. Barngrover, James D. Cleary, Thomas M. Olsen
  • Orthodontic bracket base
    Patent number: D340523
    Type: Grant
    Filed: December 28, 1990
    Date of Patent: October 19, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Conrad A. Barngrover