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DIFF Subgroup
G11C 29/08

Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing

Introduced: January 2006

Full Title

Full titles differ between systems:

IPC:

Checking stores for correct operation; Testing stores during standby or offline operation > Detection or location of defective memory elements > Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing

CPC:

Checking stores for correct operation ; Testing stores during standby or offline operation > Detection or location of defective memory elements > Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

IPC defines codes here since 2006.

Child Classifications

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  • G11C 29/10 Test algorithms, e.g. memory scan [MScan] algorithms; Test patterns, e.g. checkerboard patterns since 2006 IPC+CPC Available in IPC and CPC
  • G11C 29/48 Arrangements in static stores specially adapted for testing by means external to the store, e.g. using direct memory access [DMA] or using auxiliary access paths since 2006 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