Patents by Inventor James E. Comstock

James E. Comstock 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).

  • Cleaning and etching process for aluminum containers
    Patent number: 4477290
    Abstract: Drawn and ironed (D & I) aluminum can bodies are prepared for conversion coating by cleaning and etching using a spray of a dilute aqueous solution of caustic and chelating agent at temperatures of up to about 130.degree. F. The dilute aqueous alkaline solution consists essentially of from about 6 to 12 grams per liter of an alkali metal hydroxide and from about 3 to 6 grams per liter of a chelating agent. The cleaning and etching can be accomplished in a single step without smut formation.
    Type: Grant
    Filed: January 10, 1983
    Date of Patent: October 16, 1984
    Assignee: Pennwalt Corporation
    Inventors: James W. Carroll, James E. Comstock