Patents by Inventor George B. Alexander

George B. Alexander 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 for cleaning and passivating a metal surface
    Patent number: 3957529
    Abstract: A cleaning solvent useful in the cleaning of metal surfaces, e.g. nickle-iron alloys, contains sulfamic acid, citric acid, a solvent for hydrocarbon residues, and a surfactant. Metal surfaces are cleaned by contacting the surface with the cleaning solvent and then passivated by contact with aqueous solutions of citric acid or sodium nitrite or a combination of the two.
    Type: Grant
    Filed: June 3, 1974
    Date of Patent: May 18, 1976
    Assignee: The Dow Chemical Company
    Inventors: George B. Alexander, Norman F. Carpenter