Patents by Inventor Gabriel A Verhelst

Gabriel A Verhelst 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).

  • Patent number: 6881783
    Abstract: Process for preparing a polyol comprising particulate material is dispersed from and in an amount 30-80% by weight.
    Type: Grant
    Filed: May 5, 2000
    Date of Patent: April 19, 2005
    Assignee: Huntsman International LLC
    Inventors: Gabriel A Verhelst, Alphonse E J Bruyninckx
  • Patent number: 5691389
    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: November 27, 1996
    Date of Patent: November 25, 1997
    Assignee: Imperial Chemical Industries PLC
    Inventors: Giovanni Parrinello, David Thorpe, Gabriel Verhelst, Julian Francis George Hopper, Mireille Berthine Albert De Witte
  • Patent number: 5624972
    Abstract: A method for the preparation of flexible polymeric foam by reacting a polyisocyanate component with an isocyanate-reactive component comprising at least 50% by weight of water, the polyisocyanate component comprising at least two polyisocyanate compositions, one of them being a low NCO isocyanate terminated prepolymer and the second being a high NCO polyisocyanate.
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: April 29, 1997
    Assignee: Imperial Chemical Industries PLC
    Inventors: Louis Muller, Tu Pham, Gabriel Verhelst
  • 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
  • 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
  • Patent number: 5430072
    Abstract: A method for the preparation of flexible polymeric foam by reacting a polyisocyanate component with an isocyanate-reactive component comprising at least 50% by weight of water, the polyisocyanate component comprising at least two polyisocyanate compositions, one of them being a low NCO isocyanate terminated prepolymer and the second being a high NCO polyisocyanate.
    Type: Grant
    Filed: July 8, 1993
    Date of Patent: July 4, 1995
    Assignee: Imperial Chemical Industries plc
    Inventors: Louis Muller, Tu Pham, Gabriel Verhelst
  • Patent number: 5344584
    Abstract: An isocyanate-reactive composition comprising a first isocyanate-reactive compound and a second isocyanate-reactive compound which is normally immiscible with the first isocyanate-reactive compound and a stabilizing amount of a surfactant compound comprising a carboxylic acid ester or amide carrying a terminal acid group selected from carboxymethyl, sulphate, sulphonate, phosphate and phosphonate, provided that the methyl radical of the carboxymethyl group is not directly attached to a carbon atom of an unsubstituted hydrocarbon chain containing two or more carbon atoms.
    Type: Grant
    Filed: December 18, 1991
    Date of Patent: September 6, 1994
    Assignee: Imperial Chemical Industries Plc.
    Inventors: Gabriel Verhelst, Philip Cornet, Benoit F. de Veubeke, Bleys: Geert
  • Patent number: 5334689
    Abstract: Process for preparing a flexible foam by reacting an isocyanate prepolymer having a free NCO content of 2-15% by weight, an isocyanate prepolymer having a free content of 25-31% by weight and an isocyanate-reactive composition comprising water.
    Type: Grant
    Filed: January 12, 1994
    Date of Patent: August 2, 1994
    Assignee: Imperial Chemical Industries PLC
    Inventors: Louis Muller, Gabriel Verhelst
  • Patent number: 5314928
    Abstract: A method for preparing a polyurethane/polyurea flexible foam which comprises reacting:A. an organic prepolymer-containing polyisocyanate composition of NCO content of from 2 to 15% by weight;B. an isocyanate reactive component in which the isocyanate-reactive species comprises at least 40% by weight of water and at least one chain extender of molecular weight below 1000 which is selected from those having at least two amine groups of which at least one is directly attached to a cyclic hydrocarbon residue and from diamino polyols.
    Type: Grant
    Filed: October 10, 1991
    Date of Patent: May 24, 1994
    Assignee: Imperial Chemical Industries PLC
    Inventor: Gabriel Verhelst
  • Patent number: 5278274
    Abstract: A continuous process for the preparation of an isocyanate-terminated prepolymer having an NCO content in the range from 2 to 15% by weight, said process comprising the steps of:(A) continuously delivering to a reaction zone an organic polyisocyanate composition and an isocyanate reactive compound having an average molecular weight of at least 1000 the relative proportions of isocyanate composition and isocyanate reactive compound being appropriate for the formation of a prepolymer having an NCO content in the indicated range;(B) allowing the isocyanate composition and the isocyanate reactive compound to react in the reaction zone to form an isocyanate-terminated prepolymer, and(C) continuously removing the prepolymer from the reaction zone.
    Type: Grant
    Filed: October 10, 1991
    Date of Patent: January 11, 1994
    Assignee: Imperial Chemical Industries plc
    Inventors: Gabriel Verhelst, Louis Muller, Alain Parfondry
  • Patent number: 5270348
    Abstract: Process for preparing a flexible foam by reacting an isocyanate prepolymer having a free NCO content of 2-15% by weight, an isocyanate prepolymer having a free content of 25-31% by weight and an isocyanate-reactive composition comprising water.
    Type: Grant
    Filed: April 12, 1993
    Date of Patent: December 14, 1993
    Assignee: Imperial Chemical Industries plc
    Inventors: Louis Muller, Gabriel Verhelst
  • Patent number: 5134172
    Abstract: An isocyanate-reactive composition comprising:(1) a first isocyanate-reactive compound having a functionality of from 2 to about 4 and an average equivalent weight of from about 750 to about 3000.(2) a second isocyanate-reactive compound which is normally immiscible with the first isocyanate-reactive compound and has a functionality of at least 2 and an average equivalent weight of at least 30, and(3) a miscibilizing amount of dispersed polyurethane and/or polyurea particles.
    Type: Grant
    Filed: June 21, 1990
    Date of Patent: July 28, 1992
    Assignee: Imperial Chemical Industries PLC
    Inventors: Alfons Bruyninckx, Gabriel Verhelst
  • Patent number: 5070114
    Abstract: The invention relates to a liquid isocyanate-containing prepolymer composition having an average isocyanate functionality greater than 2 and an NCO content of from 2 to 15% by weight, as obtainable by reacting an isocyanate reactive polymer having an average nominal functionality of from 2 to 6 with a stoichiometric excess of a diphenylmethane diisocyanate composition containing at least 2% by weight of 2,4'-diphenylmethane diisocyanate and having an average isocyanate functionality in the range from 2 to 2.3. The invention also relates to a method for preparing a polyurethane foam, which comprises reacting such a prepolymer composition with water.
    Type: Grant
    Filed: April 16, 1990
    Date of Patent: December 3, 1991
    Assignee: Imperial Chemical Industries PLC
    Inventors: Arun Watts, Louis Muller, Gabriel Verhelst, Mireille De Witte, Tu Pham, Alain Parfondry
  • Patent number: 5034427
    Abstract: A method to prepare polyurethane and/or polyurea flexible foams which comprises reacting:A. an organic polyisocyanate compositionB. an isocyanate-reactive composition containing:a. at least one high Mw isocyanate-reactive compoundb.sub.1. a primary or secondary amino-functional compound (so-called chain-extender) of Mw below 1000 in an amount of less than 1% by wt of high Mw isocyanate-reactive compound(s) orb.sub.2. a mixture of at least two chain extenders of which at least one is a primary or secondary amino-functional compound of Mw below 1000, in an amount of 0.1% to 10% by wt of high Mw isocyanate-reactive compound(s)C. H.sub.2 OD. optionally catalystsE. optionally further blowing agents which are different from H.sub.2 O.F. optionally further conventional additives.
    Type: Grant
    Filed: November 22, 1989
    Date of Patent: July 23, 1991
    Assignees: Imperial Chemical Industries PLC, Atlas Europol SpA
    Inventors: Roberto Frigo, Gian-Carlo Bagaglio, Mireille De Witte, Gabriel Verhelst
  • Patent number: 4382925
    Abstract: The invention relates to E-5-(2-halogenovinyl)-2'-deoxycytidines, e.g. E-5-(bromovinyl)-2'-deoxycytidine and E-5-(2-iodovinyl)-2'-deoxycytidine. These substances are endowed with specific antiviral activities towards herpes simplex virus and with an extremely low toxicity which makes them useful in antiviral medicines and for treatment of virus diseases in man and animal. They may be synthesized by introduction of an E-5-(2-halogenovinyl) sidechain into 2'-deoxycytidine, or by condensation of a trialkylsilyl derivative of E-5-(2-halogenovinyl)-cytosine with a hydroxyl-protected reactive derivative of 2'-deoxy-D-erythro-pentofuranose.
    Type: Grant
    Filed: October 2, 1980
    Date of Patent: May 10, 1983
    Assignees: The University of Birmingham, Stichting Rega V.Z.W.
    Inventors: Erik de Clercq, Gabriel A. Verhelst, Albert S. Jones, Richard T. Walker
  • Patent number: RE34669
    Abstract: A method to prepare polyurethane and/or polyurea flexible foams which comprises reacting:A. an organic polyisocyanate compositionB. an isocyanate-reactive composition containing:a. at least one high Mw isocyanate-reactive compoundb.sub.1. a primary or secondary amino-functional compound (so-called chain-extender) of Mw below 1000 in an amount of less than 1% by wt of high Mw isocyanate-reactive compound(s) orb.sub.2. a mixture of at least two chain extenders of which at least one is a primary or secondary amino-functional compound of Mw below 1000, in an amount of 0.1% to 10% by wt of high Mw isocyanate-reactive compound(s)C. H.sub.2 OD. optionally catalystsE. optionally further blowing agents which are different from H.sub.2 O.F. optionally further conventional additives.
    Type: Grant
    Filed: December 9, 1991
    Date of Patent: July 19, 1994
    Assignees: Imperial Chemical Industries PLC, Atlas Europol SpA
    Inventors: Roberto Frigo, Gian-Carlo Bagaglio, Gabriel Verhelst, Mireille De Witte