Patents by Inventor Narayanan Madhavan

Narayanan Madhavan 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).

  • Visible light cured impression material
    Patent number: 4761136
    Abstract: A dental impression material which comprises a pre-polymer formed by reacting a polyol or combination polyester polyol with a diisocyanate, and then with a hydroxyacrylate or hydroxymethacrylate; along with a metal catalyst, plasticizer, photosensitizer, reducing agent, filler and other additives. The essential characteristics of the polymer portion that makes the system work are that it is a long-chain aliphatic polyester-polyurethane molecule, which when endcapped with hydroxy arcylate moieties, is photo-polymerizable to yield a tear-resistant, highly flexible, medium-durometer elastomer, suitable for use as a dental impression material.
    Type: Grant
    Filed: August 6, 1987
    Date of Patent: August 2, 1988
    Assignee: Kerr Manufacturing Company
    Inventors: Narayanan Madhavan, Carole L. Groh, Robert L. Probst
  • Barium aluminum silicate filler for U.V. curable composites
    Patent number: 4252526
    Abstract: A single paste photopolymerizable dental restoration composition which utilizes a barium-aluminum-silicate glass filler material.
    Type: Grant
    Filed: May 24, 1979
    Date of Patent: February 24, 1981
    Assignee: Sybron Corporation
    Inventors: Narayanan Madhavan, Frank H. Freeman
  • Barium aluminum silicate filler for U.V. curable composites
    Patent number: 4192795
    Abstract: A single paste photopolymerizable dental restoration composition which utilizes a barium-aluminum-silicate glass filler material.
    Type: Grant
    Filed: September 29, 1977
    Date of Patent: March 11, 1980
    Assignee: Sybron Corporation
    Inventors: Narayanan Madhavan, Frank H. Freeman