Patents by Inventor Michael J. Parkingston

Michael J. Parkingston 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).

  • Aluminosilicates and detergent composition
    Patent number: 5512266
    Abstract: Aluminosilicates in the form of P type zeolites are used as detergency builders and have a silicon to aluminium ratio not greater than 1.33, preferably above 0.9. These zeolites will usually have a calcium binding capacity of at least 150 mg CaO per gram of anhydrous aluminosilicate. A preferred form of the zeolite P has a silicon to aluminium ratio up to 1.15, and preferably above 0.9, with a tetragonally distorted cubic crystal structure. A process of the preparation of these zeolite P builders is described.
    Type: Grant
    Filed: September 7, 1994
    Date of Patent: April 30, 1996
    Assignee: Unilever Patent Holdings BV
    Inventors: Graham T. Brown, Theo J. Osinga, Michael J. Parkingston, Andrew T. Steel
  • Type B aluminosilicates with low Si:Al ratio for detergent use
    Patent number: 5374370
    Abstract: Aluminosilicates in the form of P type zeolites are used as detergency builders and have a silicon to aluminium ratio not greater than 1.33, preferably above 0.9. These zeolites will usually have a calcium binding capacity of at least 150 mg CaO per gram of anhydrous aluminosilicate. A preferred form of the zeolite P has a silicon to aluminium ratio up to 1.15, and preferably above 0.9, with a tetragonally distorted cubic crystal structure. A process of the preparation of these zeolite P builders is described.
    Type: Grant
    Filed: February 2, 1993
    Date of Patent: December 20, 1994
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Graham T. Brown, Theo J. Osinga, Michael J. Parkingston, Andrew T. Steel