Patents by Inventor Ian Michael Johnson

Ian Michael Johnson 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).

  • Polymeric compositions and their production and uses
    Patent number: 6031037
    Abstract: A stable, pourable, liquid composition contains 20 to 60% by weight of a blend of a water soluble high IV polymer and a water soluble low IV cationic coagulant polymer, is selected from polyamines, cationic dicyandiamide polymers and polymers of 70 to 100% ethylenically unsaturated cationic monomer with 0 to 30% by weight acrylamide, and contains 0.01 to 1 part by weight of a water soluble multi-hydroxy compound per part by weight of the coagulant polymer.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: February 29, 2000
    Assignee: Ciba Specialty Chemicals Water Treatments Limited
    Inventors: Mark Sirfaraz Ghafoor, Malcolm Skinner, Ian Michael Johnson
  • Polymeric compositions and their production and uses
    Patent number: 6001920
    Abstract: A stable, pourable, liquid composition contains a blend of at least 8% (usually at least 15%) water soluble high IV cationic polymer and a water soluble low IV cationic coagulant polymer which preferably comprises polyamine, and water soluble inorganic salt.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: December 14, 1999
    Assignee: Ciba Specialty Chamicals Water Treatments Limited
    Inventors: Mark Sirfaraz Ghafoor, Malcolm Skinner, Ian Michael Johnson
  • 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