Patents by Inventor Daniel T. Reiner

Daniel T. Reiner 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).

  • Identification system comprising a partially reflective retardation device
    Patent number: 4659112
    Abstract: There is disclosed a tamper-free identification system, such as an ID card, comprising an information-bearing substrate made of a flexible but substantially rigid material, a partial light reflector superposed over said substrate which produces a substantially nondepolarizing light reflection, and a substantially transparent 90.degree. retarder superposed over said reflector. Said identification card can be manufactured at low cost using techniques known in the art, and with the aid of a simple and inexpensive analyzer such as a linear light polarizer, fraudulent alternations of the identification card can readily be detected.
    Type: Grant
    Filed: December 3, 1984
    Date of Patent: April 21, 1987
    Assignee: Optical Devices, Incorporated
    Inventors: Daniel T. Reiner, Lawrence Bolt, Philip W. Morlan, Jr., Ali Tavasolian