Patents by Inventor Colin John Kerwin

Colin John Kerwin 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).

  • Water displacement device
    Patent number: 6243886
    Abstract: A water displacement device for water storage vessels such as toilet tanks, the device comprising a perforated plastics bag including a super-absorbent polymer in granular form which, when wetted, expands to up to two hundred times its pre-absorption volume. The bag may be weighted and may be placed in a toilet tank where it expands to displace between two and five litres of water within a toilet tank otherwise containing at least nine litres of water, thereby reducing wasteful water consumption.
    Type: Grant
    Filed: February 11, 1999
    Date of Patent: June 12, 2001
    Assignee: Kma (U. K.) Limited
    Inventor: Colin John Kerwin