Patents by Inventor ANDREW NEIL CAMMIDGE

ANDREW NEIL CAMMIDGE 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 device using liquid crystals
    Patent number: 9279084
    Abstract: The invention generally relates to optically variable devices, methods of preparation and applications or uses therefor. In particular, the invention includes trigger molecules employed as a dopant for a liquid crystal material. The liquid crystal material contains helical elements having a natural twist. The dopant is effective to change the natural twist of the helical elements when the dopant is addressed with incident light. Suitable dopants are selected from binaphthalene and derivatives thereof.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: March 8, 2016
    Assignees: OPSEC SECURITY GROUP, INC., UNIVERSITY OF EAST ANGLIA
    Inventors: Paul Dunn, Robert Edward Renton, Andrew Neil Cammidge
  • SECURITY DEVICE USING LIQUID CRYSTALS
    Publication number: 20140264168
    Abstract: The invention generally relates to optically variable devices, methods of preparation and applications or uses therefor. In particular, the invention includes trigger molecules employed as a dopant for a liquid crystal material. The liquid crystal material contains helical elements having a natural twist. The dopant is effective to change the natural twist of the helical elements when the dopant is addressed with incident light. Suitable dopants are selected from binaphthalene and derivatives thereof.
    Type: Application
    Filed: March 13, 2014
    Publication date: September 18, 2014
    Applicant: OPSEC SECURITY GROUP, INC.
    Inventors: PAUL DUNN, ROBERT EDWARD RENTON, ANDREW NEIL CAMMIDGE