Patents by Inventor Hugh J. O'Donnell

Hugh J. O'Donnell 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).

  • Ether-based polyurethane elevator sheave liner-polyurethane-urea made from polyether urethane prepolymer chain extended with polyester/diamine blend
    Patent number: 5112933
    Abstract: An ether-based polyurethane article comprises a toluene diisocyanate-terminated polyether polyol prepolymer cured with a blended polyester polyol/diamine curative. The article may be made by mixing a toluene diisocyanate-terminated polyether polyol prepolymer with a blended polyester polyol/diamine curative to form a reaction mixture. A suitably shaped mold is preheated and filled with the reaction mixture with sufficient pressure to displace air in the mold. The reaction mixture is held in the preheated mold to cure the reaction mixture and form the article. The cast article is removed from the mold and post-cured to complete the chemical cross-linking reaction.
    Type: Grant
    Filed: April 16, 1991
    Date of Patent: May 12, 1992
    Assignee: Otis Elevator Company
    Inventors: Hugh J. O'Donnell, Vincent J. Gajewski, Knizley James B., Richard L. Palinkas, Ronald O. Rosenberg