Patents by Inventor William J. Asbell

William J. Asbell 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).

  • Spirolactonelactams
    Patent number: 4968812
    Abstract: A novel class of bis(spirolactonelactam) compounds is produced by reaction of a primary diamine in the presence of a stoichiometric excess of a spirodilactam precursor selected from ketodiacid compounds and 1,6-dioxo [4.4] spirodilactones.
    Type: Grant
    Filed: June 23, 1989
    Date of Patent: November 6, 1990
    Assignee: Shell Oil Company
    Inventors: Pen-Chung Wang, William J. Asbell