Patents by Inventor Freya Tan

Freya Tan 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).

  • Patent number: 7618517
    Abstract: A method and apparatus are presented for determining the quantity of liquid and solid content in a removal stream of a froth created from a suspension that is generated during a froth flotation operation. Specifically, electrodes are immersed in the froth generated from a suspension having a known quantity of fiber particles, and the conductance of the froth is measured to establish a relationship between the measured conductance and the quantity of fiber particles. The electrodes are then submerged in a froth generated from a suspension having an unknown quantity of fiber particles, and the froth conductance is measured. The quantity of fiber particles in the froth can then be determined from the pre-established relationship between conductance and solid particle content.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: November 17, 2009
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: JunYong Zhu, Freya Tan, Roland Gleisner
  • Publication number: 20080236777
    Abstract: A method and apparatus are presented for determining the quantity of liquid and solid content in a removal stream of a froth created from a suspension that is generated during a froth flotation operation. Specifically, electrodes are immersed in the froth generated from a suspension having a known quantity of fiber particles, and the conductance of the froth is measured to establish a relationship between the measured conductance and the quantity of fiber particles. The electrodes are then submerged in a froth generated from a suspension having an unknown quantity of fiber particles, and the froth conductance is measured. The quantity of fiber particles in the froth can then be determined from the pre-established relationship between conductance and solid particle content.
    Type: Application
    Filed: March 31, 2008
    Publication date: October 2, 2008
    Inventors: JunYong Zhu, Freya Tan, Roland Gleisner
  • Patent number: 7381305
    Abstract: A method and apparatus are presented for determining the quantity of liquid and solid content in a removal stream of a froth created from a suspension that is generated during a froth flotation operation. Specifically, electrodes are immersed in the froth generated from a suspension having a known quantity of fiber particles, and the conductance of the froth is measured to establish a relationship between the measured conductance and the quantity of fiber particles. The electrodes are then submerged in a froth generated from a suspension having an unknown quantity of fiber particles, and the froth conductance is measured. The quantity of fiber particles in the froth can then be determined from the pre-established relationship between conductance and solid particle content.
    Type: Grant
    Filed: March 25, 2005
    Date of Patent: June 3, 2008
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: JunYong Zhu, Freya Tan, Roland Gleisner
  • Publication number: 20060213255
    Abstract: A method and apparatus are presented for determining the quantity of liquid and solid content in a removal stream of a froth created from a suspension that is generated during a froth flotation operation. Specifically, electrodes are immersed in the froth generated from a suspension having a known quantity of fiber particles, and the conductance of the froth is measured to establish a relationship between the measured conductance and the quantity of fiber particles. The electrodes are then submerged in a froth generated from a suspension having an unknown quantity of fiber particles, and the froth conductance is measured. The quantity of fiber particles in the froth can then be determined from the pre-established relationship between conductance and solid particle content.
    Type: Application
    Filed: March 25, 2005
    Publication date: September 28, 2006
    Inventors: Jun Zhu, Freya Tan, Roland Gleisner
  • Patent number: 5223090
    Abstract: The present invention relates to a method for loading a chemical compound within the fibers of a fibrous material and to the fibrous materials produced by the method. In the method, a fibrous cellulose material is provided which consists of a plurality of elongated fibers having a fiber wall surrounding a hollow interior. The fibrous material has a moisture content such that the level of water ranges from 40-95% of the weight of the fibrous material and the water is positioned substantially within the hollow interior of the fibers and within the fiber walls of the fibers. A chemical is added to the fibrous material in a manner such that the chemical is disposed in the water present in the fibrous material. The fibrous material is then contacted with a gas which is reactive with the chemical to form a water insoluble chemical compound. The method provides a fibrous material having a chemical compound loaded within the hollow interiors and within the fiber walls of the plurality of fibers.
    Type: Grant
    Filed: December 11, 1991
    Date of Patent: June 29, 1993
    Assignee: The United States of America as represented by The Secretary of Agriculture
    Inventors: John H. Klungness, Daniel F. Caulfield, Irving B. Sachs, Marguerite S. Sykes, Freya Tan, Richard W. Shilts
  • Patent number: RE35460
    Abstract: The present invention relates to a method for loading a chemical compound within the fibers of a fibrous material and to the fibrous materials produced by the method. In the method, a fibrous cellulose material is provided which consists of a plurality of elongated fibers having a fiber wall surrounding a hollow interior. The fibrous material has a moisture content such that the level of water ranges from 40-95% of the weight of the fibrous material and the water is positioned substantially within the hollow interior of the fibers and within the fiber walls of the fibers. A chemical is added to the fibrous material in a manner such that the chemical is disposed in the water present in the fibrous material. The fibrous material is then contacted with a gas which is reactive with the chemical to form a water insoluble chemical compound. The method provides a fibrous material having a chemical compound loaded within the hollow interiors and within the fiber walls of the plurality of fibers.
    Type: Grant
    Filed: October 21, 1993
    Date of Patent: February 25, 1997
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: John H. Klungness, Daniel F. Caulfield, Irving B. Sachs, Marguerite S. Sykes, Freya Tan, Richard W. Shilts