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    Method of making magnetic recordings which cannot be altered without it being noticed
    1.
    发明授权
    Method of making magnetic recordings which cannot be altered without it being noticed 失效
    制作磁记录的方法，如果没有被注意到，则不能改变

    公开(公告)号：US3883892A

    公开(公告)日：1975-05-13

    申请号：US40697273

    申请日：1973-10-16

    Applicant: BASF AG

    Inventor： KNELLER ECKART ,  KOESTER EBERHARD ,  WUNSCH GERD ,  DEIGNER PAUL ,  GRAW DIETER

    IPC: C09D5/23 ,  C09D7/12 ,  G03G5/16 ,  G11B5/02 ,  G11B5/62 ,  G11B5/64 ,  G11B5/70 ,  G11B5/706 ,  G11B23/28 ,  G01D15/12

    CPC classification number: G11B23/281 ,  G03G5/16 ,  G11B5/64 ,  G11B5/70 ,  G11B5/706

    Abstract: The invention relates to a method of recording magnetic signals on magnetic recording media containing an exchange-anisoptropic material at a temperature lower than, equal to or higher than the Neel temperature of this magnetic material. After the recording has been made, the magnetic recording medium is heated to a temperature equal to, or higher than, the Neel temperature, then cooled down to a temperature below the Neel temperature and the recording temperature, following which it is provided with an indicator which betrays re-heating. The method is suitable for the space-saving and, at the same time, authentic recording and storage of all data and images which are to be preserved without risk of falsification.

    Abstract translation: 本发明涉及一种在低于等于或高于该磁性材料的Neel温度的温度下将磁信号记录在含有交换异向材料的磁记录介质上的方法。 在记录完成之后，将磁记录介质加热到等于或高于Neel温度的温度，然后冷却到低于Neel温度和记录温度的温度，随后设置有指示器 它背叛了再加热。

    3.
    发明专利
    未知

    公开(公告)号：FR2536896A3

    公开(公告)日：1984-06-01

    申请号：FR8318831

    申请日：1983-11-25

    Applicant: BASF AG

    Inventor： PFEFFERKORN DIETMAR ,  NERSCHBACH GERHARD ,  KOESTER EBERHARD ,  KREIMES NORBERT ,  PAVELKA BOZIDAR

    IPC: G11B23/04 ,  G11B23/28

    Abstract: A tape cassette comprising at least one print-through echo-erasing device in the form of at least one appropriately shaped magnetic member made of permanent magnet material which is conveniently arranged on a tape guide element or near the apertures in the front wall of the cassette housing for the admission of scanning means. Such echo-erasing device can be used with advantage in any kind of magnetic tape cassette or cassette containing a recording medium having at least one magnetic track.

    MAGNETIC TAPE CASSETTE HOUSING WITH SEPARATE REEL HOLDER
    6.
    发明专利
    MAGNETIC TAPE CASSETTE HOUSING WITH SEPARATE REEL HOLDER 未知

    公开(公告)号：CA1151290A

    公开(公告)日：1983-08-02

    申请号：CA366365

    申请日：1980-12-09

    Applicant: BASF AG

    Inventor： REIMER KARL-JUERGEN ,  PFEFFERKORN DIETMAR ,  KOESTER EBERHARD ,  KREIMES NORBERT ,  ANDRIESSEN WILHELMUS ,  WAGNER HERBERT ,  WAGNER WERNER

    IPC: G11B23/04 ,  G11B23/087 ,  G11B23/08

    Abstract: A cassette arrangement for a recording medium in strip or tape form, particularly a magnetic tape, for use with a recording and/or playback apparatus having drive means and scanning means, comprising two separate components, viz. an approximately rectangular cassette housing and a protective reel-holder, at least said housing being of a construction permitting opening and closing thereof. The cassette housing has openings for admitting the drive means and scanning means and, in one of the openings which is located adjacent the front of the housing, guide means for the recording medium, and also having means for receiving, when the housing is open, said reel-holder in a predetermined position. The reel-holder accommodates the hub or hubs on which the recording medium is wound to form a reel or reels, in a location or locations such as to permit, in cooperation with the receiving means, introduction of the reel(s) into the open cassette housing in the correct position for operation.

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