Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
IPC Main Group
B01D 21/00

Separation of suspended solid particles from liquids by sedimentation

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:
PERFORMING OPERATIONS; TRANSPORTING
Class:
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Subclass:
SEPARATION

Filing statistics

IPC B01D 21/00 belongs to the parent subclass B01D, which recorded 1,309,454 patent applications worldwide between 2013 and 2023. Annual filings grew from 46,604 in 2013 to 187,276 in 2023 (+302%), peaking at 197,396 applications in 2020. The most active applicants in class B01 are SINOPEC (CHINA PETROCHEMICAL CORPORATION) (16,893 applications), CHINESE ACADEMY OF SCIENCES (11,733 applications) and BASF (BADISCHE ANILIN & SODA FABRIK) (3,898 applications).

Source: EPO PATSTAT, worldwide filings

Additional Content

Devices for separating or removing fatty or oily substances or similar floating material from water, waste water, or sewage

Related Keywords

FLOCCULATIONPRECIPITATION of particles in liquidsSEDIMENTATIONsettling TANKS

7 direct subcodes

Child Classifications

Navigate with arrow keys, Enter to open

  • B01D 21/01 using flocculating agents
  • B01D 21/24 Feed or discharge mechanisms for settling tanks
  • B01D 21/26 Separation of sediment aided by centrifugal force
  • B01D 21/28 Mechanical auxiliary equipment for acceleration of sedimentation, e.g. by vibrators or the like

Top Applicants

Top 10 applicants by patent filingsfor class B01, 2013–2023, worldwide · Source: EPO PATSTAT

  1. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 16,893
  2. CHINESE ACADEMY OF SCIENCES 11,733
  3. BASF (BADISCHE ANILIN & SODA FABRIK) DE 3,898
  4. LG CHEM KR 3,367
  5. PETROCHINA COMPANY 3,224
  6. IFPEN (IFP ENERGIES NOUVELLES) FR 3,042
  7. ZHEJIANG UNIVERSITY 2,890
  8. MANN + HUMMEL DE 2,740
  9. JOHNSON MATTHEY GB 2,534
  10. SAUDI ARABIAN OIL COMPANY SA 2,527