Patents by Inventor Jeff M. Tennant

Jeff M. Tennant 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).

  • Compositions having low birefringence
    Patent number: 6323291
    Abstract: A thermoplastic molding composition suitable for the preparation of articles having low birefringence is disclosed. Accordingly, the composition contains polycarbonate and a polyester copolymer based on cyclohexane-dimethanol, ethylene glycol and phthalic acid. The invention resides in the findings that the incorporation of a polycarbonate resin having a melt flow index greater than 18 g/10 minutes impart to the composition low birefringence values. The composition is suitable for the preparation of optical storage media, including compact discs.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: November 27, 2001
    Assignee: Bayer Corporation
    Inventors: James P. Mason, Jon M. Newcome, Jeff M. Tennant
  • Polycarbonate composition useful in optical storage applications
    Patent number: 6069225
    Abstract: A thermoplastic polycarbonate composition suitable for the preparation of optical storage devices, for instance optical discs, is disclosed. The composition, containing a stabilizing amount of partially fatty acid ester and as a stabilizer, a compound the structure of which contains at least one benzofuran-2-one group per molecule, features improved resistance to yellowing, reduced haze and high total light transmission values.
    Type: Grant
    Filed: March 17, 1999
    Date of Patent: May 30, 2000
    Assignee: Bayer Corporation
    Inventors: Michael A. Gerace, Sivaram Krishnan, James B. Johnson, Jeff M. Tennant