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DIFF Subgroup
E03B 3/26

with packed filtering material

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Methods or installations for obtaining or collecting drinking water or tap water > from underground > Obtaining and confining water by means of wells > Component parts of wells > Well filters > formed of loose materials, e.g. gravel > with packed filtering material

CPC:

Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) > from underground > Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B43/00) > Component parts of wells > Well filters (filters in general B01D24/00 - B01D35/00) > formed of loose materials, e.g. gravel > with packed filtering material

No child classifications to compare. This is a leaf node in both IPC and CPC.

Top Applicants

Top Applicants (IPC)

Class E03,2013–2023, worldwide · Source: EPO PATSTAT

  1. TOTO 2,957
  2. LIXIL CORPORATION 1,646
  3. XIAMEN RT PLUMBING TECHNOLOGY COMPANY 925
  4. NEOPERL DE 870
  5. GROHE DE 828
  6. PANASONIC INTELLECTUAL PROPERTY 738
  7. WUHAN SHENGYU DRAINAGE SYSTEMS COMPANY 727
  8. GEBERIT INTERNATIONAL CH 613
  9. KOHLER COMPANY US 570
  10. TOTO JP 549

Top Applicants (CPC)

Class E03,2013–2023, worldwide · Source: EPO PATSTAT

  1. NEOPERL DE 934
  2. GROHE DE 870
  3. TOTO 646
  4. GEBERIT INTERNATIONAL CH 629
  5. KOHLER COMPANY US 621
  6. TOTO JP 590
  7. LIXIL CORPORATION JP 429
  8. AS AMERICA US 324
  9. HANSGROHE SE DE 314
  10. LIXIL CORPORATION 307