Patents by Inventor David J. HANSFORD

David J. HANSFORD 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).

  • Speckle reduction
    Patent number: 11860378
    Abstract: A device (100) for speckle reduction, comprising an optical cell (110) and a controller (130). The optical cell (110) comprises a first and second cell wall (121, 122) spaced apart by a gap, and a liquid crystal composition (114) in the gap. The controller (130) is configured to cause fluid turbulence in the liquid crystal composition. The fluid turbulence in the liquid crystal composition (114) results in time varying spatially random scattering of light (102) transmitted through the liquid crystal composition (114). The liquid crystal composition (114) has a chiral nematic phase.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: January 2, 2024
    Assignee: OXFORD UNIVERSITY INNOVATION LIMITED
    Inventors: David J. Hansford, Julian A. J. Fells, Steve Elston, Stephen M. Morris
  • SPECKLE REDUCTION
    Publication number: 20190196216
    Abstract: A device (100) for speckle reduction, comprising an optical cell (110) and a controller (130). The optical cell (110) comprises a first and second cell wall (121, 122) spaced apart by a gap, and a liquid crystal composition (114) in the gap. The controller (130) is configured to cause fluid turbulence in the liquid crystal composition. The fluid turbulence in the liquid crystal composition (114) results in time varying spatially random scattering of light (102) transmitted through the liquid crystal composition (114). The liquid crystal composition (114) has a chiral nematic phase.
    Type: Application
    Filed: August 16, 2017
    Publication date: June 27, 2019
    Inventors: David J. HANSFORD, Julian A.J. FELLS, Steve ELSTON, Stephen M. MORRIS