Patents by Inventor John Goeffrey Hopwood

John Goeffrey Hopwood 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).

  • Detection of counterfeit objects, for instance counterfeit banknotes
    Patent number: 5915518
    Abstract: Detecting counterfeit banknotes is achieved by directing ultraviolet light at a sample from a source (104) and measuring the level of ultraviolet light reflected from the sample using a first photocell (105) and the amount of fluorescent light generated by the sample using a second photocell (106). The detected levels are compared with reference levels and only if both reflective and fluorescent criteria are satisfied is the note declared genuine. The sample, during test, is swiped over a glass window (102), preferably under an overlying shield.
    Type: Grant
    Filed: September 25, 1996
    Date of Patent: June 29, 1999
    Assignee: Mars, Incorporated
    Inventors: John Goeffrey Hopwood, Lydia J. Baron, Linda J. Tenenbaum, Stephen Paul Raphael, Philip Robert Skipper