Patents by Inventor Alexander W. S. Duncan

Alexander W. S. Duncan 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).

  • Preparations of polymer polyols
    Patent number: 4810750
    Abstract: A process for the production of a fluid polymer polyol containing (a) greater than 30% by weight polymer and/or (b) a poly(acrylonitrile/styrene) copolymer comprising between 65 and 90% by weight polystyrene is provided. By using a peroxydicarbonate catalyst during the process, products of improved viscosity and filtrability are produced.
    Type: Grant
    Filed: September 4, 1984
    Date of Patent: March 7, 1989
    Assignee: BP Chemicals Limited
    Inventor: Alexander W. S. Duncan
  • Flame retardant phenolic foams
    Patent number: 4681902
    Abstract: This invention relates to flame retardant phenol aldehyde foams which have a k value below 0.020 W/mk. The foams have as flame retardants a blend of a halosubstituted diphenyl oxide and an organic phosphorus compound. The feature of the invention is that unlike conventional flame retardants, the blend now used does not adversely affect the low k value i.e. the low thermal conductivity of the foam.
    Type: Grant
    Filed: November 3, 1986
    Date of Patent: July 21, 1987
    Assignee: BP Chemicals Limited
    Inventors: Alexander W. S. Duncan, David G. Summers, Kenneth C. Thomas