Patents by Inventor Paul R. Collins

Paul R. Collins 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).

  • Toughness coating for crystalline orthodontic brackets
    Patent number: 4988293
    Abstract: A single crystal orthodontic bracket is disclosed which is provided with an outer protective layer of a polycrystalline material so as to provide fracture toughness of the orthodontic bracket.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: January 29, 1991
    Assignee: Union Carbide Chemicals and Plastics Company Inc.
    Inventors: Paul R. Collins, Larry R. Rothrock
  • Crystalline orthodontic bracket
    Patent number: 4932865
    Abstract: A sapphire orthodontic bracket with enhanced tolerance to fabrication, installation and use is fabricated such that the "r" planes of the sapphire are at substantially equal angles to the longitudinal axis of the arch wire groove of the bracket.
    Type: Grant
    Filed: July 18, 1988
    Date of Patent: June 12, 1990
    Assignee: Union Carbide Chemicals and Plastics Company Inc.
    Inventors: Paul R. Collins, Larry R. Rothrock
  • Crystalline orthodontic bracket
    Patent number: 4902224
    Abstract: A crystalline orthodontic bracket with enhanced tolerance to fabrication, installation and use is composed of zirconia, yttria, magnesia or strontium titanate.
    Type: Grant
    Filed: December 19, 1988
    Date of Patent: February 20, 1990
    Assignee: Union Carbide Chemicals and Plastics Company Inc.
    Inventors: Paul R. Collins, Larry R. Rothrock