Patents by Inventor Geoffrey F. Hewitt

Geoffrey F. Hewitt 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).

  • Methods and apparatus for determining the permeability and diffusivity of a porous solid
    Patent number: 8447537
    Abstract: An apparatus for measuring the permeability and diffusivity of a porous solid includes a device for measuring permeability of the solid; a device for measuring diffusivity of the solid; a sample chamber for holding a sample of the solid, the arrangement being such that the permeability and diffusivity can be measured without removing the sample from the sample chamber.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: May 21, 2013
    Assignees: Halliburton Energy Services, Inc., Imperial College London
    Inventors: Alexander Bismarck, Geoffrey F. Hewitt, Karen Shu San Manley, Johnny W. Johnson
  • Methods and Apparatus for Determining the Permeability and Diffusivity of a Porous Solid
    Publication number: 20100268488
    Abstract: Apparatus for measuring the permeability and diffusivity of a porous solid comprising: a permeability measuring means for measuring permeability of the solid; a diffusivity measuring means for measuring diffusivity of the solid; a sample chamber for holding a sample of the solid, the arrangement being such that the permeability and diffusivity can be measured without removing the sample from the sample chamber.
    Type: Application
    Filed: February 24, 2010
    Publication date: October 21, 2010
    Applicants: HALLIBURTON ENERGY SERVICES, INC., IMPERIAL COLLEGE LONDON
    Inventors: Alexander Bismarck, Geoffrey F. Hewitt, Karen Shu San Manley, Johnny W. Johnson
  • Single-step, solid-state competitive immunoassay
    Patent number: 5891658
    Abstract: Simplicity, sensitivity and versatility of optical sensors based on competitive immunoassays using antibody-antigen reactions are achieved by solid-state, single-step reactions which permit accurate sensitive qualitative and quantitative information to be obtained without human participation. All of the chemistry-biochemistry is an inherent part of the sensor. A direct reaction occurs when the sample (antigen) is brought in contact with the sensor. The sensitivity of the competitive immunoassay optical sensor is controlled and increased by selecting a tag for the antigen or altering the attachment of a tag to an antigen so that the binding of tagged antigen to an antibody is decreased relative to the binding of untagged antigen to the antibody. The user can vary size, molecular weight and geometric configuration of the tagged antigen.
    Type: Grant
    Filed: June 27, 1996
    Date of Patent: April 6, 1999
    Assignee: FCI--FiberChem, Inc.
    Inventors: Stanley M. Klainer, Stephen L. Coulter, Geoffrey F. Hewitt
  • Ultrasensitive single-step, solid-state competitive immunoassay sensor with interference modifier and/or gel layer
    Patent number: 5780251
    Abstract: Simplicity, sensitivity and versatility of optical sensors based on competitive immunoassays using antibody-antigen reactions are achieved by solid-state, single-step reactions which permit accurate sensitive qualitative and quantitative information to be obtained without human participation. All of the chemistry-biochemistry is an inherent part of the sensor. A direct reaction occurs when the sample (antigen) is brought in contact with the sensor. The sensitivity of the competitive immunoassay optical sensor is controlled and increased by selecting a tag for the antigen or altering the attachment of a tag to an antigen so that the binding of tagged antigen to an antibody is decreased relative to the binding of untagged antigen to the antibody. The user can vary size, molecular weight and geometric configuration of the tagged antigen.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: July 14, 1998
    Assignee: FCI FiberChem, Inc.
    Inventors: Stanley M. Klainer, Stephen L. Coulter, Geoffrey F. Hewitt