Patents by Inventor Stephen J. Haigh

Stephen J. Haigh 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).

  • Weld thickness monitoring in resistance welding apparatus
    Patent number: 4788405
    Abstract: Apparatus, for measuring the thickness of a welding seam produced by resistance welding between a resiliently mounted upper roll and a lower roll, comprises a source of light mounted laterally of the resiliently mounted roll and a light collector mounted to receive such light as is not eclipsed by the periphery of the roll so that variation in the amount of light received as the roll periphery interrupts the light is indicative of weld thickness. The light received is preferably converted by means to an electrical signal which is analyzed to discern the quality of the weld.
    Type: Grant
    Filed: May 27, 1987
    Date of Patent: November 29, 1988
    Assignee: Metal Box Public Limited Company
    Inventors: Stephen J. Haigh, Martin J. Melville, Martin J. Melville