Patents by Inventor Bernard C. Obi-Ahuba

Bernard C. Obi-Ahuba 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).

  • Extrusion of vinylidene chloride copolymers under inert atmosphere
    Patent number: 5045259
    Abstract: The present invention is a process for forming an extruded article containing a copolymer of vinylidene chloride and at least one other ethylenically-unsaturated comonomer, said process comprising the step of extruding the copolymer in the presence of (1) at least one gas which is inert with respect to the copolymer and does not plasticize the copolymer; and (2) essentially no gases which are not inert with respect to the copolymer. Vinylidene chloride copolymers extruded according to the process of the present invention have lower metal adhesion and less tendency to contain specks of carbon than do vinylidene chloride copolymer copolymers extruded under an air atmosphere.
    Type: Grant
    Filed: March 14, 1990
    Date of Patent: September 3, 1991
    Assignee: The Dow Chemical Company
    Inventors: Jack A. Berdasco, Stephen R. Betso, Kun S. Hyun, Bobby A. Howell, Bernard C. Obi-Ahuba