Patents by Inventor Michael Lee Mitchell

Michael Lee Mitchell 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).

  • Boundary apparatus for optical component molding
    Patent number: 5893998
    Abstract: A molding apparatus for molding an optical component comprises first and second mold sections (20-26, 34) forming opposite sides of a mold cavity (40). The mold cavity has a peripheral edge (43) contacting the optical component during the molding process which is made to reduce the transfer of heat through the peripheral edge (43). In one embodiment of the invention, the peripheral edge is made from a titanium alloy (56) having thermal conductivity approximately 50% of a thermal conductivity of stainless steel. In another embodiment of the invention, the peripheral edge of the mold is made from a porous titanium material (56a) having a density substantially less than the solid titanium alloy. In a further embodiment of the invention, the peripheral edge of the mold is made from a polyimide (70) having oxygen atoms implanted in its surface.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: April 13, 1999
    Assignees: Sony Corporation, Digital Audio Disc Corporation
    Inventors: Matthew Olen Kelley, Han H. Nee, Michael Lee Mitchell, James Arthur Thorp, III