Patents by Inventor David John Poynton

David John Poynton 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).

  • Flame-retardant filaments
    Patent number: 3944384
    Abstract: Flame-retardant acrylic filaments containing a flame retardant which is the reaction product of a dibasic acid amide, an oxyacid of phosphorus and a polyhydroxy alcohol, the flame retardant being bound to the acrylic filaments by a cross-linking agent. The filaments are made flame-retardant by applying the flame retardant and cross-linking agent to the filaments and subsequently heating the filaments to chemically bind the flame retardant to the acrylic filaments.
    Type: Grant
    Filed: November 4, 1974
    Date of Patent: March 16, 1976
    Assignee: Courtaulds Limited
    Inventor: David John Poynton