on a base layer

Introduced: September 1968

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

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

Of 8 combined children, 7 exist in both systems.

1 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1985.

Child Classifications

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G11B 5/7013 CPC only CPC only
G11B 5/702 characterised by the bonding agent since 1985 +6 CPC IPC+CPC Available in IPC and CPC
G11B 5/706 characterised by the composition of the magnetic material since 1985 +2 CPC IPC+CPC Available in IPC and CPC
G11B 5/708 characterised by addition of non-magnetic particles to the layer since 1985 +1 CPC IPC+CPC Available in IPC and CPC
G11B 5/71 characterised by the lubricant since 1985 IPC+CPC Available in IPC and CPC
G11B 5/712 characterised by the surface treatment or coating of magnetic particles since 1985 IPC+CPC Available in IPC and CPC
G11B 5/714 characterised by the dimension of the magnetic particles since 1985 IPC+CPC Available in IPC and CPC
G11B 5/716 characterised by two or more magnetic layers 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