Recording, reproducing, or erasing methods; Read, write or erase circuits therefor

Introduced: September 1968

Title

Titles differ between systems:

IPC: Recording, reproducing or erasing methods; Read, write or erase circuits therefor

CPC: Recording, reproducing, or erasing methods; Read, write or erase circuits therefor

Full Title

Full titles differ between systems:

IPC:

Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor > Recording, reproducing or erasing methods; Read, write or erase circuits therefor

CPC:

Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor (G11B11/00 take precedence) > Recording, reproducing, or erasing methods; Read, write or erase circuits therefor

Of 4 combined children, 3 exist in both systems.

1 codes are CPC-only extensions.

IPC defines codes here since 1974.

Child Classifications

Navigate with arrow keys, Enter to open

G11B 5/022 CPC only CPC only
G11B 5/024 Erasing since 1985 +1 CPC IPC+CPC Available in IPC and CPC
G11B 5/027 Analogue recording since 1974 +1 CPC IPC+CPC Available in IPC and CPC
G11B 5/09 Digital recording since 1974 IPC+CPC Available in IPC and CPC