Patents by Inventor David Henry Stone

David Henry Stone 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).

  • Preparation of a recording carrier
    Patent number: 6428872
    Abstract: Disclosed is a molded disc useful in optical information recording carriers, the disc is comprised of a copolymer of methyl methacrylate and ethyl acrylate, wherein the copolymer is comprised of 97 to 99.9 wt. % of methyl methacrylate and 0.1 to 3 weight % ethyl acrylate, has a molecular weight in the range of from 90,000 to 115,000, has a Tg of from 105° C. to 115.
    Type: Grant
    Filed: April 21, 2000
    Date of Patent: August 6, 2002
    Assignee: ATOFINA
    Inventors: Michael Stefan Cholod, Donald Richard Hone, David Henry Stone
  • Preparation of a recording carrier
    Patent number: 6261660
    Abstract: The invention relates to a process for preparing molded discs suitable for use in optical information recording carriers and to the optical information recording carriers thereby obtainable. The process comprises plasticating a homopolymer or a copolymer of methyl methacrylate, injecting the plasticated homopolymer or copolymer into a mold to form a disc and removing the molded disc in a very short cycle time. Good quality discs which are particularly suitable for use in optical information recording carriers may thereby be obtained.
    Type: Grant
    Filed: December 15, 1999
    Date of Patent: July 17, 2001
    Assignee: Atofina
    Inventors: Michael Stefan Cholod, Donald Richard Hone, David Henry Stone