Patents by Inventor William Albert Wood

William Albert Wood 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).

  • Patent number: 4037007
    Abstract: Paper for use in the production of security documents incorporates planchettes which have incorporated therein or applied thereto a substance which is capable of taking part in a color-forming reaction. A second substance which is capable of taking part in a different color-forming reaction may be incorporated in other planchettes. When a reagent or reagents is or are applied to the security document to verify the authenticity of the document the substances change color by the color-forming reactions.Examples of security documents which may be made from such paper are bank cheques, travellers' cheques and other negotiable documents convertible to cash.
    Type: Grant
    Filed: July 30, 1975
    Date of Patent: July 19, 1977
    Assignee: Portals Limited
    Inventor: William Albert Wood