Patents by Inventor David J. Arrowsmith

David J. Arrowsmith 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).

  • Surface pretreatment of aluminium and aluminium alloys prior to adhesive bonding, electroplating or painting
    Patent number: 4624752
    Abstract: A method of surface pretreatment for aluminium or aluminium alloys before adhesive coating, electroplating or painting comprises a first anodizing step using an acid selected to produce a dense-packed, thick-walled anodic oxide coating followed by an etching step to modify the outer surface of the oxide coating while leaving the inner part unaffected.The anodizing acid may be sulphuric acid or chromic acid and the etch acid may be phosphoric acid, chromic acid or a mixture of sulphuric and chromic acids.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: November 25, 1986
    Assignee: The Secretary of State for Defence in Her Brittanic Majesty's Government of the United Kingdom of Great Britian and Northern Ireland
    Inventors: David J. Arrowsmith, Andrew W. Clifford