Patents by Inventor Nancy L. Shields

Nancy L. Shields 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).

  • Biostable polyurethane
    Patent number: 5159051
    Abstract: A thermoplastic polyurethane having prolonged biostability has tertiary amino groups in the polymer chain. Protonation of the amino groups with an aqueous acid causes the polymer to absorb up to 1,700% by weight of water and swell. The protonated amino groups form a complex with an antithrombogenic agent to give an antithrombogenic polyurethane. The invention includes a shaped article of the polyurethane.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: October 27, 1992
    Assignee: Becton, Dickinson and Company
    Inventors: Fidelis C. Onwumere, Nancy L. Shields
  • Method for rendering a substrate surface antithrombogenic
    Patent number: 4865870
    Abstract: A method for heparinizing a substrate includes applying a coating of ammonium salt to a substrate by steeping the substrate in a solution of the salt at an alkaline pH and contacting the coated substrate with a solution of a salt of heparin.
    Type: Grant
    Filed: July 7, 1988
    Date of Patent: September 12, 1989
    Assignee: Becton, Dickinson and Company
    Inventors: Can B. Hu, Donald D. Solomon, Nancy L. Shields