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    3.
    发明专利
    未知

    公开(公告)号：DE69227013T2

    公开(公告)日：1999-06-02

    申请号：DE69227013

    申请日：1992-12-07

    Applicant: IBM

    Inventor： FRANCO LUIS PADILLA ,  KAUFMAN JAMES HARVEY ,  METIN SERHAT ,  PALMER DANNY DEAN ,  SAPERSTEIN DAVID DORN ,  WU ANTHONY WAI

    IPC: G11B5/64 ,  G11B5/72 ,  G11B5/73

    Abstract: A thin film metal alloy magnetic recording disk has a protective nitrogen-containing carbon overcoat which is thinner and which exhibits better wear resistance, corrosion resistance, and hardness than conventional carbon overcoats without nitrogen. The nitrogen present in the disk overcoat substantially reduces the film stress. Because of the low stress of the overcoat film there is significantly less likelihood that the overcoat will delaminate, buckle, or otherwise wear away from the underlying magnetic layer during operation of the disk file. This allows for significantly reduced overcoat thickness, thus reducing the head-disk spacing in the disk file. The overcoat, even though significantly thinner than prior art carbon overcoats, exhibits better wear and corrosion resistance than carbon overcoats without nitrogen. In addition, when the carbon overcoat contains hydrogen, the presence of the nitrogen increases the hardness of the film if present in a specific amount dependent on the amount of hydrogen present.

    4.
    发明专利
    未知

    公开(公告)号：DE69227013D1

    公开(公告)日：1998-10-22

    申请号：DE69227013

    申请日：1992-12-07

    Applicant: IBM

    Inventor： FRANCO LUIS PADILLA ,  KAUFMAN JAMES HARVEY ,  METIN SERHAT ,  PALMER DANNY DEAN ,  SAPERSTEIN DAVID DORN ,  WU ANTHONY WAI

    IPC: G11B5/64 ,  G11B5/72 ,  G11B5/73

    Abstract: A thin film metal alloy magnetic recording disk has a protective nitrogen-containing carbon overcoat which is thinner and which exhibits better wear resistance, corrosion resistance, and hardness than conventional carbon overcoats without nitrogen. The nitrogen present in the disk overcoat substantially reduces the film stress. Because of the low stress of the overcoat film there is significantly less likelihood that the overcoat will delaminate, buckle, or otherwise wear away from the underlying magnetic layer during operation of the disk file. This allows for significantly reduced overcoat thickness, thus reducing the head-disk spacing in the disk file. The overcoat, even though significantly thinner than prior art carbon overcoats, exhibits better wear and corrosion resistance than carbon overcoats without nitrogen. In addition, when the carbon overcoat contains hydrogen, the presence of the nitrogen increases the hardness of the film if present in a specific amount dependent on the amount of hydrogen present.

    5.
    发明专利
    未知

    公开(公告)号：DE69738266T2

    公开(公告)日：2008-08-28

    申请号：DE69738266

    申请日：1997-09-25

    Applicant: IBM

    Inventor： KAUFMAN JAMES HARVEY ,  SINCERBOX GLENN TAVERNIA

    IPC: G06F1/00 ,  G07F7/10 ,  G06F11/34 ,  G06F13/00 ,  G06F21/20 ,  G06Q20/08 ,  G06Q20/10 ,  G06Q20/34 ,  G06Q20/36 ,  G06Q20/40 ,  G06Q40/00 ,  G07F7/12 ,  G07F19/00

    Abstract: A system for rejecting second and subsequent copies of an informationally-equivalent card or badge asserted into a client/server system by processing only those cards having transaction histories recorded thereon by comparison matching a history recorded in a central repository and then rewriting the history on the card and in the repository. The rewritten histories include the current transaction. Counterfeit cards, informationally equivalent to the original card prior to the transaction update of the original card, will be rejected when asserted into the system since their histories mismatch that recorded in the repository.

    7.
    发明专利
    未知

    公开(公告)号：DE69738266D1

    公开(公告)日：2007-12-20

    申请号：DE69738266

    申请日：1997-09-25

    Applicant: IBM

    Inventor： KAUFMAN JAMES HARVEY ,  SINCERBOX GLENN TAVERNIA

    IPC: G06F1/00 ,  G07F7/10 ,  G06F11/34 ,  G06F13/00 ,  G06F21/20 ,  G06Q20/08 ,  G06Q20/10 ,  G06Q20/34 ,  G06Q20/36 ,  G06Q20/40 ,  G06Q40/00 ,  G07F7/12 ,  G07F19/00

    Abstract: A system for rejecting second and subsequent copies of an informationally-equivalent card or badge asserted into a client/server system by processing only those cards having transaction histories recorded thereon by comparison matching a history recorded in a central repository and then rewriting the history on the card and in the repository. The rewritten histories include the current transaction. Counterfeit cards, informationally equivalent to the original card prior to the transaction update of the original card, will be rejected when asserted into the system since their histories mismatch that recorded in the repository.

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