Patents by Inventor Ragunath Padiyath

Ragunath Padiyath 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).

  • Light dispersing film and method of manufacture
    Patent number: 6692647
    Abstract: A beaded light dispersing film has a substrate layer, and an optically transparent layer, having a predetermined thickness, disposed over a side of the substrate layer. Optically transmitting beads are arranged to penetrate at least partially into the transparent layer to define clear apertures at interfaces between the beads and the transparent layer. The bead radius is greater than the predetermined thickness. An absorbing layer is disposed on the transparent layer, in interstices between the beads. A method of manufacturing the film includes disposing optically transparent beads partially in an optically transparent layer disposed over a transparent substrate layer. The optically transparent layer has a thickness less than half a diameter of a transparent bead. An absorbing layer overlies the optically transparent layer.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: February 17, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: Robert S. Moshrefzadeh, Ragunath Padiyath, Richard J. Pokorny, Hsin-hsin Chou, Jeffrey C. Chang, Colleen M. Brenner
  • Light dispersing film and method of manufacture
    Publication number: 20020034618
    Abstract: A beaded light dispersing film has a substrate layer, and an optically transparent layer, having a predetermined thickness, disposed over a side of the substrate layer. Optically transmitting beads are arranged to penetrate at least partially into the transparent layer to define clear apertures at interfaces between the beads and the transparent layer. The bead radius is greater than the predetermined thickness. An absorbing layer is disposed on the transparent layer, in interstices between the beads. A method of manufacturing the film includes disposing optically transparent beads partially in an optically transparent layer disposed over a transparent substrate layer. The optically transparent layer has a thickness less than half a diameter of a transparent bead. An absorbing layer overlies the optically transparent layer.
    Type: Application
    Filed: September 28, 2001
    Publication date: March 21, 2002
    Applicant: 3M Innovative Properties Company
    Inventors: Robert S. Moshrefzadeh, Ragunath Padiyath, Richard J. Pokorny, Hsin-hsin Chou, Jeffrey C. Chang, Colleen M. Brenner
  • Light dispersing film and method of manufacture
    Patent number: 6344263
    Abstract: A beaded light dispersing film has a substrate layer, and an optically transparent layer, having a predetermined thickness, disposed over a side of the substrate layer. Optically transmitting beads are arranged to penetrate at least partially into the transparent layer to define clear apertures at interfaces between the beads and the transparent layer. The bead radius is greater than the predetermined thickness. An absorbing layer is disposed on the transparent layer, in interstices between the beads. A method of manufacturing the film includes disposing optically transparent beads partially in an optically transparent layer disposed over a transparent substrate layer. The optically transparent layer has a thickness less than half a diameter of a transparent bead. An absorbing layer overlies the optically transparent layer.
    Type: Grant
    Filed: November 13, 1998
    Date of Patent: February 5, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Robert S. Moshrefzadeh, Ragunath Padiyath, Richard J. Pokorny, Hsin-hsin Chou, Jeffrey C. Chang, Colleen M. Brenner