Patents by Inventor Aaldrik R. Postema

Aaldrik R. Postema 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).

  • Methods of preparing polymeric foams using cyclic urea blowing promoters
    Patent number: 5578656
    Abstract: A method for the preparation of cellular polymeric products which comprises reacting an organic polyisocyanate with an isocyanate-reactive composition, characterised in that the isocyanate-reactive composition comprises a blowing promoter which is a cyclic urea compound having at least one isocyanate-reactive substituent.
    Type: Grant
    Filed: June 24, 1994
    Date of Patent: November 26, 1996
    Assignee: Imperial Chemical Industries PLC
    Inventors: Herbert R. Gillis, Aaldrik R. Postema, Dirk Stanssens