Patents by Inventor John M. Liddell

John M. Liddell 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).

  • Polymer compositions and processes
    Patent number: 5525658
    Abstract: Melt processed articles of improved color and odor can be produced from hydroxyalkanoic acid polymers if they are melt processed in the presence of a temperature stable sulphite salt, and compositions for use in such processes are disclosed.
    Type: Grant
    Filed: January 24, 1995
    Date of Patent: June 11, 1996
    Assignee: Zeneca Limited
    Inventors: John M. Liddell, William Greer