Patents Assigned to Dudley Mills Pty Ltd.
  • Patent number: 6946076
    Abstract: Methods and compositions for removing phosphate from swimming pool waters are disclosed. The compositions include both soluble and substantially insoluble lanthanide carboxylates, preferred examples being lanthanum glycolate and lactate. The methods include the addition of the lanthanide compounds to the bulk of the pool water, but preferably involve the loading of the pool filter with the composition and the circulation of pool water through the filter to effect the removal of dissolved phosphate in the water.
    Type: Grant
    Filed: November 19, 2004
    Date of Patent: September 20, 2005
    Assignees: Dudley Mills Pty Ltd., Innovez Pty Ltd.
    Inventor: Dudley John Mills
  • Patent number: 6146539
    Abstract: Methods and compositions are disclosed for treating swimming pool waters in order to remove one or more nutrients necessary for algal growth and to accelerate the breakdown of objectionable chloramines within chlorinated pool waters. The target nutrients of preference are those containing phosphorus or nitrogen. Phosphorus nutrients are preferably removed by ion-exchange with finely divided lanthanum carbonate, or by direct precipitation in the pool with liquid lanthanum chloride. Nitrogen nutrients (including, in particular, chloramines) may be removed (possibly with the aid of catalysts and in separate reactors). The same reagents used to scavenge phosphates are useful in this regard, the nitrogen being released from the pool water as a nitrogenous gas. To allow the fine lanthanum carbonates to be conveniently handled in the pool environment, they may be linked to larger carrier particles, such as those of diatomaceous earth, or they may be embedded within porous beads formed from polymers or gels.
    Type: Grant
    Filed: March 23, 1999
    Date of Patent: November 14, 2000
    Assignees: Dudley Mills Pty Ltd, Innovez Pty Ltd
    Inventor: Dudley John Mills