Skip to content
Search Classifications
Search for IPC and CPC classification codes or keywords
DIFF Subgroup
G11C 11/409

Read-write [R-W] circuits

Introduced: January 1990

Full Title

Full titles differ between systems:

IPC:

Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor > using electric elements > using semiconductor devices > using transistors > forming cells needing refreshing or charge regeneration, i.e. dynamic cells > Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing > for memory cells of the field-effect type > Read-write [R-W] circuits

CPC:

Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor (G11C14/00 - G11C21/00 take precedence) > using electric elements > using semiconductor devices > using transistors > forming cells needing refreshing or charge regeneration, i.e. dynamic cells > Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing > for memory cells of the field-effect type > Read-write [R-W] circuits

IPC and CPC are identically structured here. All 6 subcodes exist in both systems.

IPC defines codes here since 2000.

Child Classifications

Navigate with arrow keys, Enter to open

  • G11C 11/4091 Sense or sense/refresh amplifiers, or associated sense circuitry, e.g. for coupled bit-line precharging, equalising or isolating since 2000 IPC+CPC Available in IPC and CPC
  • G11C 11/4093 Input/output [I/O] data interface arrangements, e.g. data buffers since 2000 IPC+CPC Available in IPC and CPC
  • G11C 11/4094 Bit-line management or control circuits since 2000 IPC+CPC Available in IPC and CPC
  • G11C 11/4096 Input/output [I/O] data management or control circuits, e.g. reading or writing circuits, I/O drivers or bit-line switches since 2000 IPC+CPC Available in IPC and CPC
  • G11C 11/4097 Bit-line organisation, e.g. bit-line layout, folded bit lines since 2000 IPC+CPC Available in IPC and CPC
  • G11C 11/4099 Dummy cell treatment; Reference voltage generators since 2000 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

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

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

Top Applicants (CPC)

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

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