Patents by Inventor David R. Arnott

David R. Arnott 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).

  • Method of determining susceptibility of alloys to stress corrosion cracking
    Patent number: 4217180
    Abstract: Accelerated testing method for determining the susceptibility of alloys to stress corrosion cracking. Test parts are anodized to form an oxide coating thereon. The anodized parts are deformed to a known amount of tensile strain sufficient to rupture the oxide. Microcracks created in the oxide coating occur at the situs of where stress corrosion cracks will occur in service. The parts are reanodized such as to anodically heal the microcracks and the reanodization current transient recorded. The rate of current decay during reanodization is indicative of the alloy's susceptibility to stress corrosion cracking.
    Type: Grant
    Filed: July 17, 1979
    Date of Patent: August 12, 1980
    Assignee: General Motors Corporation
    Inventors: William J. Baxter, David R. Arnott