Patents by Inventor Donald William Tomkins

Donald William Tomkins 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 having optically variable device portion and method of making the same
    Patent number: 9279927
    Abstract: A security device includes a liquid crystal layer having one of a cholesteric phase, a nematic phase, and a cholesteric phase and having molecules therein aligned volumetrically in a predetermined manner to form a predetermined diffractive optical pattern or image. The molecules of the liquid crystal layer are volumetrically aligned in the predetermined manner through at least a portion of the thickness of the liquid crystal layer.
    Type: Grant
    Filed: February 15, 2013
    Date of Patent: March 8, 2016
    Assignee: OPSEC SECURITY GROUP, INC.
    Inventor: Donald William Tomkins
  • Optically variable devices, security device and article employing same, and associated method of creating same
    Patent number: 9025251
    Abstract: An optically variable device (“OVD”) with an integral image system that includes a focusing element and an array of micro-objects which, when viewed through the focusing element, changes in appearance depending on the relative location from which the OVD is observed. A security device including the OVD and methods for creating the OVD are also disclosed.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: May 5, 2015
    Assignee: Opsec Security Group, Inc.
    Inventors: Paul Dunn, Robert Edward Renton, Donald William Tomkins
  • SECURITY DEVICE HAVING OPTICALLY VARIABLE DEVICE PORTION AND METHOD OF MAKING THE SAME
    Publication number: 20140232974
    Abstract: A security device includes a liquid crystal layer having one of a cholesteric phase, a nematic phase, and a cholesteric phase and having molecules therein aligned volumetrically in a predetermined manner to form a predetermined diffractive optical pattern or image. The molecules of the liquid crystal layer are volumetrically aligned in the predetermined manner through at least a portion of the thickness of the liquid crystal layer.
    Type: Application
    Filed: February 15, 2013
    Publication date: August 21, 2014
    Applicant: OPSEC SECURITY GROUP, INC.
    Inventor: DONALD WILLIAM TOMKINS
  • OPTICALLY VARIABLE DEVICES, SECURITY DEVICE AND ARTICLE EMPLOYING SAME, AND ASSOCIATED METHOD OF CREATING SAME
    Publication number: 20110317271
    Abstract: An optically variable device (“OVD”) with an integral image system that includes a focusing element and an array of micro-objects which, when viewed through the focusing element, changes in appearance depending on the relative location from which the OVD is observed. A security device including the OVD and methods for creating the OVD are also disclosed.
    Type: Application
    Filed: December 10, 2010
    Publication date: December 29, 2011
    Inventors: Paul Dunn, Robert Edward Renton, Donald William Tomkins
  • Laminate structure
    Patent number: 6316082
    Abstract: The present invention relates to the field of laminated materials and, in particular, to laminates (1) for stamping foils and security threads (1). In one aspect there is provided a laminate (1) for a stamping foil comprising a carrier layer, a translucent or transparent coloured first lacquer layer (5), a translucent or transparent second lacquer layer (10) disposed between the carrier layer and the first lacquer layer and a light-reflecting layer (20) adjacent to the first lacquer layer, wherein the first lacquer layer is incomplete in a region substantially in register with an incomplete region in the light-reflecting layer such that the carrier layer is partially covered by the first lacquer layer and the light-reflecting layer (20).
    Type: Grant
    Filed: May 5, 2000
    Date of Patent: November 13, 2001
    Assignee: API Group PLC
    Inventors: Donald William Tomkins, Thomas Anthony Bleasdale, Lynn Shona Hardie Fergusson