Patents by Inventor Nelson J. Newhard

Nelson J. Newhard 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).

  • Chromate conversion composition and method for coating aluminum using low concentrations of chromate, phosphate and fluoride ions
    Patent number: 4131489
    Abstract: This invention relates to a composition and method for coating aluminum in order to improve both corrosion resistance and paint adhesion. By using very low concentrations of hexavalent chromium ions, phosphate ions and fluoride ions in the coating composition, the characteristics of the treated aluminum surfaces are improved, while process waste disposal problems are minimized.
    Type: Grant
    Filed: March 31, 1978
    Date of Patent: December 26, 1978
    Assignee: Amchem Products, Inc.
    Inventor: Nelson J. Newhard, Jr.
  • Method of forming a hydrophilic coating on an aluminum surface
    Patent number: 3989550
    Abstract: A method of forming a hydrophilic coating on an aluminum surface comprises the steps of:A. etching the aluminum surface;B. treating the etched aluminum surface with an acidic first aqueous solution comprising from about 0.5 to about 3 g/l of active fluoride, from about 2.5 to about 60 g/l of chromate ion (calculated as CrO.sub.3) and from about 2 to about 300 g/l of phosphate ion, so as to form a coating having a weight of at least 150 mg/sq. ft.;C. treating the aluminum surface with an alkaline second solution containing an alkali metal silicate; andD. baking the treated aluminum surface.
    Type: Grant
    Filed: April 21, 1975
    Date of Patent: November 2, 1976
    Assignee: Amchem Products, Inc.
    Inventor: Nelson J. Newhard