Patents by Inventor Paul Mark Stevens

Paul Mark Stevens 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).

  • DVD disc with four information layers, and method for making same
    Patent number: 6177168
    Abstract: A method for making a DVD-18 disc using primarily just conventional CD-type injection molding and sputtering equipments. Three substrates are molded. Each of two of the substrates has just one metallic information layer, with the opposite side being flat. The third substrate has two metallic information layers on its opposite sides. The three substrates are arranged in a sandwich configuration, with the substrate having two information layers being in the middle. Each of the outer substrates has a semireflective (gold) information layer that faces inwardly of the sandwich. The middle substrate has two fully reflective (aluminum) information layers. A very thin layer of glue is placed between the semireflective information layer on each of the outer substrates and one of the fully reflective information layers on the middle substrate.
    Type: Grant
    Filed: June 1, 1999
    Date of Patent: January 23, 2001
    Assignee: Warner Music Group, Inc.
    Inventor: Paul Mark Stevens