Patents by Inventor Colin E. Marks

Colin E. Marks 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 treatment and soil testing
    Patent number: 4775513
    Abstract: A device for treating water to reduce the concentration of cations or anions therein includes a water-tight container (4) of flexible material, designed to be able to lie substantially flat (FIG. 3) when empty and having an aperture (5) for the introduction of liquid, a strainer (7) extending across the aperture, and a closure (6) for the aperture, and a quantity of ion-exchange material (b 8) occupying a minor proportion of the available interior volume of the container. A soil extraction outfit and a soil testing outfit are described, which incorporate the water treatment device.
    Type: Grant
    Filed: March 5, 1987
    Date of Patent: October 4, 1988
    Assignee: Wilkinson & Simpson Ltd
    Inventor: Colin E. Marks
  • Water treatment and soil testing
    Patent number: RE33487
    Abstract: A device for treating water to reduce the concentration of cations or anions therein includes a water-tight container (4) of flexible material, designed to be able to lie substantially flat (FIG. 3) when empty and having an aperture (5) for the introduction of liquid, a strainer (7) extending across the aperture, and a closure (6) for the aperture, and a quantity of ion-exchange material (b 8) occupying a minor proportion of the available interior volume of the container. A soil extraction outfit and a soil testing outfit are described, which incorporate the water treatment device.
    Type: Grant
    Filed: September 8, 1989
    Date of Patent: December 11, 1990
    Assignee: Palintest Limited
    Inventor: Colin E. Marks
  • Color disc for an analytical instrument
    Patent number: D329024
    Type: Grant
    Filed: May 8, 1990
    Date of Patent: September 1, 1992
    Assignee: Palintest Ltd.
    Inventor: Colin E. Marks
  • Instrument for testing liquid samples
    Patent number: D333630
    Type: Grant
    Filed: May 22, 1990
    Date of Patent: March 2, 1993
    Assignee: Palintest Ltd.
    Inventor: Colin E. Marks
  • Analytical instrument for testing parameters of pool water
    Patent number: D335464
    Type: Grant
    Filed: May 24, 1990
    Date of Patent: May 11, 1993
    Assignee: Palintest Ltd.
    Inventor: Colin E. Marks