Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1986-02-24
1988-05-10
Thibodeau, Paul J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
427131, 428323, 428694, 428900, G11B 570
Patent
active
047434902
ABSTRACT:
Some prior magnetic recording tapes have a backside layer of electrically conductive particles and friction-imparting nonmagnetic particles in a nonmagnetic binder. The novel tape differs in that the nonmagnetic particles are replaced by high-H.sub.c ferromagnetic particles, onto which may be recorded a distinctive magnetic pattern. This provides a "magnetic watermark" that should protect recordings from being counterfeited, because if one were to copy a recording onto ordinary magnetic recording tape, the copy would lack the "watermark". This should inhibit unauthorized copying of video recordings such as motion pictures.
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Fayling: "Anisotropic Erasure and Demagnetization Characteristics of Recording Tapes Comprising Particles with Uniaxial Magnetocrystalline Anisotropy," IEEE Transactions on Magnetics, vol. MAG-13, No. 5, Sep. 1977, pp. 1391-1393.
Bovee Warren R.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Smith James A.
Thibodeau Paul J.
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