Patents by Inventor Mireille B. De Witte

Mireille B. De Witte 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).

  • Polyisocyanate compositions and low density flexible polyurethane foams produced therewith
    Patent number: 5621016
    Abstract: Polyisocyanate compositions are provided which comprise the reaction product of a diphenylmethane diisocyanate composition comprising 25 to 70% by weight of 2,4'-diphenylmethane diisocyanate and an isocyanate-reactive polyoxyethylene polyoxypropylene polyahl having an ethylene oxide content of at least 30% by weight, a number average hydroxyl equivalent weight of 700-2000 and an average nominal hydroxyl functionality of 2-6, the reaction product having a free NCO content of 2-31% by weight.
    Type: Grant
    Filed: March 16, 1994
    Date of Patent: April 15, 1997
    Assignee: Imperial Chemical Industries PLC
    Inventors: Vabilisetti S. Murty, Gabriel Verhelst, Mireille B. De Witte
  • Recycling of flexible foam
    Patent number: 5605935
    Abstract: Process for recycling flexible foams by glycolysis and extraction. The glycolysis is conducted by allowing the foam to react with low molecular weight polyols, then allowing the mixture to separate in two phases.
    Type: Grant
    Filed: March 3, 1994
    Date of Patent: February 25, 1997
    Assignee: Imperial Chemical Industries
    Inventors: Giovanni Parrinello, David Thorpe, Gabriel Verhelst, Julian F. G. Hopper, Mireille B. A. De Witte
  • Process for preparing a flexible polyurethane foam
    Patent number: 5491177
    Abstract: Process for preparing a flexible foam by reacting a polyisocyanate composition having an NCO value of 11-22% by weight with an isocyanate-reactive compound having a number average molecular weight of 1000-12000 using water as blowing agent.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: February 13, 1996
    Assignee: Imperial Chemical Industries PLC
    Inventor: Mireille B. A. De Witte