Patents by Inventor William P. Dunworth

William P. Dunworth 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).

  • Polyester filaments flame retarded with end-capped poly(m-phenylene cyclohexylphosphonate)
    Patent number: 4035442
    Abstract: Polyester filaments having improved flame retardant properties are prepared by a process in which a poly(m-phenylene cyclohexylphosphonate) compound is melted, is mixed with molten polyester, and the melt blend is forwarded to a spinning pack and is melt-spun into filaments. The compound is end-capped with p-phenylphenol or p-bromophenol to avoid reaction with the molten polyester.
    Type: Grant
    Filed: May 20, 1976
    Date of Patent: July 12, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: William P. Dunworth