Patents by Inventor Andre M. Walder

Andre M. Walder 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).

  • Process for forming surface diffusion alloy layers on refractory metallic articles
    Patent number: 4096296
    Abstract: A metal article having perforations therein whose transverse cross-sectional dimension is less than 0.4 mm has formed thereon a surface diffusion alloy by applying a refractory filter element to the workpiece surface prior to the diffusion treatment, the filter element being a refractory felt based on metal fibres including chromium in a proportion by weight of from 10 to 60%. The felt is oxidized to give a layer of chromium oxide. This is followed by conventional thermochemical powder diffusion treatment in the presence of at least one chromium oxide-reducing element selected from aluminium, yttrium, titanium and the lanthanides.
    Type: Grant
    Filed: March 5, 1976
    Date of Patent: June 20, 1978
    Assignee: Office National d'Etudes et de Recherches Aerospatiales
    Inventors: Philippe M. Galmiche, Andre R. Hivert, Andre M. Walder