Patents by Inventor Alexander Rollo Spowart

Alexander Rollo Spowart 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).

  • Security printing
    Patent number: 6966998
    Abstract: A method of providing covert security features for documents such as vouchers, packaged goods and banknotes in which the document is provided with a dopant. The dopant consisting of a material which can be identified by examination of its response to visible wavelength photon radiation and which can be applied directly on or into the document or can be fused into glass matrices before application.
    Type: Grant
    Filed: November 8, 1999
    Date of Patent: November 22, 2005
    Inventor: Alexander Rollo Spowart