Patents by Inventor David W. Levi

David W. Levi 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).

  • Adhesive bonding
    Patent number: 4835016
    Abstract: A method of pretreating a polyolefin for adhesive bonding. The method inves contacting the polyolefin with a non-chromate solution such as either lead dioxide, potassium iodate or ammonia persulfate in a combination of water and sulfuric acid.
    Type: Grant
    Filed: March 28, 1988
    Date of Patent: May 30, 1989
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Roberta Rosty, David W. Levi
  • Non-carcinogenic, non-polluting sulfuric acid etchants for preparing aluminum surfaces for adhesive bonding
    Patent number: H284
    Abstract: The invention provides a process and composition of low toxicity for prepng aluminum surfaces for adhesive bonding. According to the invention non-carcinogenic, non-polluting soluble metal salts generally, other than ferric sulfate disclosed in U.S. Pat. No. 4,212,701, when added in an effective amount to sulfuric acid, improve the adhesive bonding to aluminum when the aluminum is treated with such salt-sulfuric acid etchants prior to adhesive bonding.
    Type: Grant
    Filed: February 24, 1986
    Date of Patent: June 2, 1987
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Raymond F. Wegman, Michael J. Bodnar, David W. Levi