Patents by Inventor Theo O. Onwunaka

Theo O. Onwunaka 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).

  • Thermoplastic polyurethane method of making same and forming a medical article therefrom
    Patent number: 5545708
    Abstract: A thermoplastic polyurethane having inherent softness properties is formed from a diisocyanate, a polyetherglycol and a mixture of diol chain extenders. The mixture of chain extenders includes a first diol and a second diol which has side chain branching. A method for making the polyurethane of the present invention includes mixing the components to induce an exothermic reaction, followed by curing. The polyurethane formed is suitable for melt processing into medical devices such as catheters, other tubing, hubs and the like.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: August 13, 1996
    Assignee: Becton, Dickinson and Company
    Inventors: Theo O. Onwunaka, Mutlu Karakelle
  • Thermoplastic polyurethane blends
    Patent number: 5281677
    Abstract: A thermoplastic polyurethane chain extended with an alkylenediol is blended with a thermoplastic polyurethane chain extended with an oxyalkylene qlycol oligomer. The blend is extruded into a catheter tubing having sufficient initial stiffness for satisfactory insertion in a patient and a high degree of softening for safe positioning and long term catheterization procedures without the risk of vessel wall perforation.
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: January 25, 1994
    Assignee: Becton, Dickinson and Company
    Inventors: Theo O. Onwunaka, Fidelis C. Onwumere, James M. Lambert