Patents by Inventor Joseph Anthony Semlyen

Joseph Anthony Semlyen 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).

  • Polyesters
    Patent number: 5756644
    Abstract: A process of producing a cyclic polyester oligomer mixture using a solid support system is described. A preferred cyclic polyester mixture contains at least one cyclic polyester oligomer containing 15 or more repeat units. Cyclic ethylene terephthalate oligomers are particularly preferred. The cyclic polyester oligomers may be converted to high molecular weight linear polyesters by heating in the presence of a catalyst.
    Type: Grant
    Filed: January 7, 1997
    Date of Patent: May 26, 1998
    Assignee: Imperial Chemical Industries PLC
    Inventors: Philip Hodge, Joseph Anthony Semlyen, Anthony Garry Harrison