Patents by Inventor Harold Vernon Smith

Harold Vernon Smith 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 increasing corrosion resistance of anodized aluminum
    Patent number: 3961111
    Abstract: Anodized aluminum oxide coatings are sealed in hot water containing [N-methyl - N - (3-dimethylamino - propyl)-n-perfluorooctylsulfonamide] methylammonium iodide, [N-ethyl-n-perfluorooctyl - sulfonamido tridecaethyleneoxy) ethanol and/or a copolymer of 70% by weight methacrylic acid and 30% by weight ethyl acrylate.
    Type: Grant
    Filed: March 18, 1975
    Date of Patent: June 1, 1976
    Assignee: Pennwalt Corporation
    Inventor: Harold Vernon Smith, deceased
  • Non-chromated alkaline etching bath and etching process for aluminum
    Patent number: 3957553
    Abstract: Alkaline etching baths for aluminum are claimed in which oxidizing agents at low concentration replace chromates and fluorides in the control of galvanizing. Etching processes using these new baths are also disclosed and claimed.
    Type: Grant
    Filed: March 1, 1974
    Date of Patent: May 18, 1976
    Assignee: Pennwalt Corporation
    Inventor: Harold Vernon Smith