Patents by Inventor Luther A. Marsh

Luther A. Marsh 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).

  • Flexible extendable backing shield for welding reactive metals
    Patent number: 4866236
    Abstract: A flexible extendable backing shield for use with the welding of reactive metals such as titanium. The backing shield provides a means for selectively distributing the inert gas along the length of the shield and then diffusing the inert gas to the root side of the weld to prevent oxidation and embrittlement of the weld root. The backing shield is of modular configuration so that a plurality of the devices can be readily connected together to shield a variety of complex shapes.
    Type: Grant
    Filed: April 20, 1988
    Date of Patent: September 12, 1989
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Robert DeNale, William E. Lukens, Luther A. Marsh