Patents by Inventor David Philip Graham

David Philip Graham 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).

  • Hand held tonometer including optical procimity indicator
    Publication number: 20040249255
    Abstract: A puff tonometer includes two light sources located at diametrically opposite points, preferably equidistant from the optical axis of the objective lens assembly of the tonometer. The sources are arranged to direct light forwardly of the tonometer such that, in use, and when positioned close to a patient's eye under test, light from the two sources, after reflection by the anterior corneal surface of the eye under test, will be imaged by the objective lens assembly of the tonometer, to appear as two small areas of light in the field of view.
    Type: Application
    Filed: July 23, 2004
    Publication date: December 9, 2004
    Inventors: James Robert Arnold Matthews, John Horace Fisher, Paul Antony Merritt, Neil Anthony Atkins, David Philip Graham