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PCE
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DIFF Subgroup
C09K 8/467

containing additives for specific purposes

Introduced: January 2006

Full Title

Full titles differ between systems:

IPC:

Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations > Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells > containing inorganic binders, e.g. Portland cement > containing additives for specific purposes

CPC:

Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations > Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells (compositions for plastering C09K8/50) > containing inorganic binders, e.g. Portland cement > containing additives for specific purposes

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

IPC defines codes here since 2006.

Child Classifications

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  • C09K 8/473 Density reducing additives, e.g. for obtaining foamed cement compositions since 2006 IPC+CPC Available in IPC and CPC
  • C09K 8/48 Density increasing or weighting additives since 2006 IPC+CPC Available in IPC and CPC
  • C09K 8/487 Fluid loss control additives; Additives for reducing or preventing circulation loss since 2006 IPC+CPC Available in IPC and CPC
  • C09K 8/493 Additives for reducing or preventing gas migration since 2006 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class C09,2013–2023, worldwide · Source: EPO PATSTAT

  1. LG CHEM KR 6,420
  2. NITTO DENKO CORPORATION JP 5,752
  3. HALLIBURTON ENERGY SERVICES GROUP US 5,650
  4. 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 5,635
  5. DOW GLOBAL TECHNOLOGIES US 4,844
  6. MERCK PATENT DE 4,779
  7. CHINESE ACADEMY OF SCIENCES 4,311
  8. FUJIFILM JP 4,205
  9. BASF (BADISCHE ANILIN & SODA FABRIK) DE 4,039
  10. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 3,931

Top Applicants (CPC)

Class C09,2013–2023, worldwide · Source: EPO PATSTAT

  1. LG CHEM KR 7,954
  2. HALLIBURTON ENERGY SERVICES GROUP US 6,584
  3. NITTO DENKO CORPORATION JP 6,500
  4. 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 6,490
  5. DOW GLOBAL TECHNOLOGIES US 6,324
  6. FUJIFILM JP 5,832
  7. MERCK PATENT DE 5,481
  8. BASF (BADISCHE ANILIN & SODA FABRIK) DE 5,147
  9. SAMSUNG DISPLAY KR 5,105
  10. NITTO DENKO CORPORATION 3,584