Patents by Inventor Ali Tavasolian

Ali Tavasolian 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
  • Hydrolytically stabilized polarizer
    Patent number: 4396642
    Abstract: A polarizer having increased hydrolytic stability is produced by impregnating a polyvinyl alcohol film with an iodine containing composition and then subjecting the substrate to both concentrated infrared and ultraviolet radiation treatments.
    Type: Grant
    Filed: November 24, 1981
    Date of Patent: August 2, 1983
    Assignee: American Hoechst Corporation
    Inventors: Lawrence Bolt, Michael Smith, Ali Tavasolian
  • Polyester based polarizer
    Patent number: 4388375
    Abstract: A polarizer having increased hydrolytic stability is produced by impregnating a polyvinyl alcohol substrate with an iodine containing composition and then subjecting the substrate to both concentrated infrared and ultraviolet radiation treatments sufficient to substantially increase the hydrolytic stability of the thusly formed polarizer. The polyvinyl alcohol film had been laminated to a polyester support with a dispersed, aqueous composition of polyvinyl alcohol or polyurethane on its surface.
    Type: Grant
    Filed: November 24, 1981
    Date of Patent: June 14, 1983
    Assignee: American Hoechst Corporation
    Inventors: Michael J. Hopper, Michael R. Martin, Lawrence Bolt, Michael Smith, Ali Tavasolian