Patents by Inventor Pauline Lesley Couldwell

Pauline Lesley Couldwell 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).

  • Superabsorbent polymers and products containing them
    Patent number: 5684106
    Abstract: Particulate superabsorbent polymeric material which is a partially neutralised polymer of an ethylenically unsaturated carboxylic monomer cross linked by a triethylenic or higher ethylenic cross linking agent, preferably tetra allyl ammonium chloride, absorbs above 15 grams, and often above 18 grams, aqueous saline per gram polymeric material in 60 minutes under a load of 63,000 dynes per square centimeter. The polymer preferably has surface cross linking caused by contacting the polymer particles with inorganic and/or covalent cross linking agent for the polymer.
    Type: Grant
    Filed: June 23, 1995
    Date of Patent: November 4, 1997
    Assignee: Allied Colloids Limited
    Inventors: Ian Michael Johnson, Pauline Lesley Couldwell