characterised by two or more magnetic layers

Introduced: January 1985

Full Title

Full titles differ between systems:

IPC:

Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor > Record carriers characterised by the selection of the material > comprising one or more layers of magnetisable particles homogeneously mixed with a bonding agent > on a base layer > characterised by two or more magnetic layers

CPC:

Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor (G11B11/00 take precedence) > Record carriers characterised by the selection of the material > comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent > on a base layer > characterised by two or more magnetic layers

IPC and CPC are identically structured here. All 1 subcodes exist in both systems.

IPC defines codes here since 1985.

Child Classifications

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G11B 5/718 at least one on each side of the base layer since 1985 IPC+CPC Available in IPC and CPC