Patents by Inventor Samuel E. Johnson

Samuel E. Johnson 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).

  • Poly(urethane-urea) microcellular elastomer compositions
    Patent number: 5382646
    Abstract: Poly(urethane-urea) reaction injection molded compositions having improved processing and lower water absorption are prepared by reacting an isocyanate-terminated prepolymer prepared by reacting 4,4'-MDI or modified 4,4'-MDI and a polyoxypropylene glycol having a molecular weight of from 400 to 2500 with a polyether polyol and a hindered amine or glycol chain extender, in the presence of a urethane-reaction promoting catalyst, optionally including a hydroxyl terminated chain extender and internal mold release agent.
    Type: Grant
    Filed: August 2, 1994
    Date of Patent: January 17, 1995
    Assignee: BASF Corporation
    Inventors: Thirumurti Narayan, Samuel E. Johnson, Michael A. Dimitroff, Dietrich Schlotterbeck