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

Top Applicants

Top Applicants (IPC)

Class G11,2013–2023, worldwide · Source: EPO PATSTAT

MICRON TECHNOLOGY US 10,574
SK HYNIX KR 9,138
SAMSUNG ELECTRONICS COMPANY KR 9,004
TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY TW 3,739
IBM (INTERNATIONAL BUSINESS MACHINES CORPORATION) US 3,443
INTEL CORPORATION US 2,952
SANDISK TECHNOLOGIES US 2,905
WESTERN DIGITAL TECHNOLOGIES US 2,630
TOSHIBA CORPORATION JP 2,593
SEAGATE TECHNOLOGY US 2,472

Top Applicants (CPC)

Class G11,2013–2023, worldwide · Source: EPO PATSTAT

MICRON TECHNOLOGY US 12,397
SAMSUNG ELECTRONICS COMPANY KR 12,238
SK HYNIX KR 11,371
TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY TW 4,601
INTEL CORPORATION US 3,874
IBM (INTERNATIONAL BUSINESS MACHINES CORPORATION) US 3,866
SANDISK TECHNOLOGIES US 3,151
SK HYNIX 3,143
SAMSUNG ELECTRONICS COMPANY 3,073
WESTERN DIGITAL TECHNOLOGIES US 2,961