Patents by Inventor Dennis E. Speliotis

Dennis E. Speliotis 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).

  • Rigid disc substrate comprising a central hard core substrate with a hard, thermally and mechanically matched overlying smoothing layer and method for making the same
    Patent number: 6194045
    Abstract: A rigid magnetic memory disc (28) is disclosed having a substantially flat, central hard core substrate (12) and an overlying smoothing layer (14) deposited thereon. The smoothing layer (14) is subsequently polished to a predetermined thickness. The smoothing layer (14) should be capable of having a surface finish better than approximately ten Angstroms Ra. After the smoothing layer (14) is polished, an appropriate magnetic medium (16) and alternately, a nonmagnetic finishing layer (16) are then applied to the rigid disc substrate (10) as necessary, ultimately rendering a finished magnetic disc.
    Type: Grant
    Filed: November 22, 1995
    Date of Patent: February 27, 2001
    Inventors: William R. Annacone, Kenneth P. Felis, Dennis E. Speliotis
  • Rigid disc substrate comprising a central hard core substrate with a hard, thermally and mechanically matched overlying smoothing layer and method for making the same
    Patent number: 5487931
    Abstract: A rigid magnetic memory disc(28) is disclosed having a substantially flat, central hard core substrate(12) and an overlying smoothing layer(14) deposited thereon. The smoothing layer(14) is subsequently polished to a predetermined thickness. The smoothing layer(14) should be capable of having a surface finish better than approximately ten Angstroms Ra. After the smoothing layer(14) is polished, an appropriate magnetic medium(16) and alternately, a nonmagnetic finishing layer(16) are then applied to the rigid disc substrate(10) as necessary, ultimately rendering a finished magnetic disc.
    Type: Grant
    Filed: December 2, 1993
    Date of Patent: January 30, 1996
    Inventors: William R. Annacone, Kenneth P. Felis, Dennis E. Speliotis
  • Barium hexaferrite-silicon nitride-carbon magnetic recording medium
    Patent number: 5466524
    Abstract: A magnetic recording medium suitable for high density recording is prepared by depositing a silicon nitride interlayer onto a carbon substrate and then sputter depositing a barium hexaferrite magnetic recording layer onto the silicon nitride interlayer.
    Type: Grant
    Filed: March 1, 1994
    Date of Patent: November 14, 1995
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Youichi Hoshi, Dennis E. Speliotis, Jack H. Judy