Patents by Inventor Richard B. Jotcham

Richard B. Jotcham 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 threads
    Patent number: 5465301
    Abstract: A security thread (11) for use in security articles (10), includes a substrate having a coating on one or both sides thereof, the coating containing a thermochromic material selected from pigments and dyestuffs which changes from coloured to colourless when the temperature of the pigment or dyestuff is changed to the activation temperature. The thermochromic material may be coloured when the temperature is below the activation temperature and become colourless when the material is at the activation temperature or above. The thread (11) is for security paper (10) for use in producing banknotes and the like.
    Type: Grant
    Filed: January 19, 1994
    Date of Patent: November 7, 1995
    Assignee: Portals (Bathford) Limited
    Inventors: Richard B. Jotcham, Gerald S. Payne