Regenerating the filter material in the filter

Introduced: January 1990

Last revised: January 2006

Full Title

Filters with filtering elements which move during the filtering operation > Regenerating the filter material in the filter

Classification Context

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

Filing statistics

IPC B01D 33/44 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

3 direct subcodes

Child Classifications

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B01D 33/46 by scrapers, brushes or the like acting on the cake-side of the filtering element
B01D 33/48 by flushing, e.g. counter-current air-bumps
B01D 33/52 by forces created by movement of the filter element

Top Applicants

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

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