Dynamic magnetic information storage or retrieval – General recording or reproducing
Reexamination Certificate
2005-09-06
2005-09-06
Faber, Alan T. (Department: 2651)
Dynamic magnetic information storage or retrieval
General recording or reproducing
C360S134000
Reexamination Certificate
active
06940672
ABSTRACT:
In general, the invention provides two-sided magnetic data storage tape comprising azimuthal magnetic transition layouts that can substantially reduce demagnetization of recorded magnetic transitions on the surfaces of the tape. The invention specifically balances the goal of simplified media manufacture with the goal of reducing or avoiding media degradation when the tape is spooled. The two-sided magnetic data storage tape defines a substantially similar easy axis of magnetic anisotropy on a first and a second side of the tape, which can simplify media manufacture. Recorded magnetic transitions on the opposing sides of the tape define azimuths that are substantially different, which can help avoid media degradation when the tape is spooled.
REFERENCES:
patent: 3725611 (1973-04-01), Smaller
patent: 4363038 (1982-12-01), Fayling
patent: 5850328 (1998-12-01), Leonhardt et al.
patent: 2003/0228498 (2003-12-01), Bradshaw
“Anisotropic Erasure and Demagnetization Characteristics of Recording Tapes Comprising Particles with Uniarial Magnetocrystalline Anisotropy,”IEEE Trans. On Mag., vol. MAG-13, No. 5, pp. 1391-1393 (Sep. 1977).
Stubbs Daniel P.
Yip Yung
Faber Alan T.
Imation Corp.
Levinson Eric D.
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