Patents by Inventor David Crabb

David Crabb 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: 11723530
    Abstract: A method and apparatus are provided for measuring a sensitivity level across a visual field of a subject defined by a set of locations.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: August 15, 2023
    Assignee: UCL BUSINESS LTD
    Inventors: Haogang Zhu, David Garway-Heath, David Crabb, Marco Miranda
  • Publication number: 20200178789
    Abstract: A method and apparatus are provided for measuring a sensitivity level across a visual field of a subject defined by a set of locations.
    Type: Application
    Filed: August 10, 2017
    Publication date: June 11, 2020
    Applicant: UCL Business PLC
    Inventors: Haogang Zhu, David Garway-Heath, David Crabb, Marco Miranda
  • Patent number: 9861276
    Abstract: One embodiment of the invention provides a method for performing a supra-threshold test of sensitivity across a visual field of a subject. The method includes presenting a stimulus at each location of a set of locations spread across the visual field and obtaining for each stimulus a result indicating whether or not the stimulus was seen by the subject. The method further includes determining for each location whether or not to re-present a stimulus at that location, wherein for a given location, the determining involves combining results obtained from multiple locations. These multiple locations are defined by a cluster associated with the given location, with the cluster being determined based on the paths of optic nerve fibre bundles across the visual field.
    Type: Grant
    Filed: May 5, 2011
    Date of Patent: January 9, 2018
    Assignee: UCL BUSINESS PLC
    Inventors: David Crabb, Ciara Bergin, David Garway-Heath, Gay Verdon-Roe, Mark Westcott
  • Publication number: 20130201452
    Abstract: One embodiment of the invention provides a method for performing a supra-threshold test of sensitivity across a visual field of a subject. The method includes presenting a stimulus at each location of a set of locations spread across the visual field and obtaining for each stimulus a result indicating whether or not the stimulus was seen by the subject. The method further includes determining for each location whether or not to re-present a stimulus at that location, wherein for a given location, the determining involves combining results obtained from multiple locations. These multiple locations are defined by a cluster associated with the given location, with the cluster being determined based on the paths of optic nerve fibre bundles across the visual field.
    Type: Application
    Filed: May 5, 2011
    Publication date: August 8, 2013
    Applicant: UCL BUSINESS PLC
    Inventors: David Crabb, Ciara Bergin, David Garway-Heath, Gay Verdon-Roe, Mark Westcott
  • Patent number: 4975267
    Abstract: Stable K.sub.2 Fe.sub.22 O.sub.34 in the form of lamellar platelets useful as a dehydrogenation catalyst and a method of manufacturing the same, including the steps of mixing iron oxide and a potassium compound, such as potassium carbonate, preferably in a molar ratio of Fe to K of from 3 to 6 and calcining the mixture at a temperature of at least about 900.degree. C. for at least 15 minutes.
    Type: Grant
    Filed: June 25, 1987
    Date of Patent: December 4, 1990
    Assignee: Columbian Chemicals Co.
    Inventors: James M. Watson, David Crabbe, Thomas S. Coursen, Jr.
  • Patent number: 4963343
    Abstract: Stable K.sub.2 Fe.sub.22 O.sub.34 in the form of lamellar platelets useful as a dehydrogenation catalyst and a method of manufacturing the same, including the steps of mixing iron oxide and a potassium compound, such as potassium carbonate, preferably in a molar ration of Fe to K of from 3 to 6 and calcining the mixture at a temperature of at least about 900.degree. C. for at least 15 minutes.
    Type: Grant
    Filed: December 14, 1987
    Date of Patent: October 16, 1990
    Assignee: Columbian Chemicals Co.
    Inventors: James M. Watson, David Crabbe, Thomas S. Coursen, Jr.
  • Patent number: 4798856
    Abstract: There is provided a pigment concentrate dispersible in plastics and having a substantially improved characteristic extrusion screen life, comprising a dispersion in a resin carrier of an inorganic pigment of the type having a hydrophilic surface, having on its surface in an effective amount a surfactant of the type characterized by an attached polar terminus, in relation to the surface of the pigment, and an unattached nonpolar terminus, in relation to the carrier resin, or of the type characterized by a high molecular weight surface blocking agent. Such pigments include iron oxide pigments, red iron oxide pigment, yellow iron oxide pigment, black iron oxide pigment, divalent ferrite pigments, zinc ferrite pigment, and magnesium ferrite pigment. Such surfactants include dimethyl polysiloxane, isopropyl triisostearoyl titanate, trimethylol propane, trimethylol ethane, and low molecular weight polyethylene.
    Type: Grant
    Filed: November 6, 1987
    Date of Patent: January 17, 1989
    Assignee: Columbian Chemicals Co.
    Inventors: Jorge A. Ayala, George A. Joyce, David Crabbe
  • Patent number: 4221766
    Abstract: This process reduces the soluble iron found in the final effluent of a plant making iron oxide by the Penniman-Zoph scrap process. The finished oxide product slurry is separated from the scrap iron, and the slurry is aerated while the pH is maintained between about 3.0 and 5.0. As the soluble iron is converted to product oxide, the pH of the system rises toward the higher value.
    Type: Grant
    Filed: December 10, 1976
    Date of Patent: September 9, 1980
    Assignee: Cities Service Company
    Inventors: Wilfred A. Pabst, David Crabbe
  • Patent number: D1035403
    Type: Grant
    Filed: January 18, 2023
    Date of Patent: July 16, 2024
    Assignee: HUSQVARNA AB
    Inventors: Wesley David Crabbe, Jonathan Taylor Merrill, Eric Tres Wangsgaard