IPC Main Group
B01D 33/00 Filters with filtering elements which move during the filtering operation
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 33/00 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
Related Keywords
drum FILTER(S)
14 direct subcodes
Child Classifications
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- B01D 33/01 with translationally moving filtering elements, e.g. pistons
- B01D 33/04 with filtering bands or the like supported on cylinders which are impervious for filtering
- B01D 33/044 with filtering bands or the like supported on cylinders which are pervious for filtering
- B01D 33/056 Construction of filtering bands or supporting belts, e.g. devices for centering, mounting or sealing the filtering bands or the supporting belts
- B01D 33/06 with rotary cylindrical filtering surfaces, e.g. hollow drums
- B01D 33/15 with rotary plane filtering surfaces
- B01D 33/27 with rotary filtering surfaces, which are neither cylindrical nor planar, e.g. helical surfaces
- B01D 33/29 the movement of the filter elements being a combination of movements
- B01D 33/333 with individual filtering elements moving along a closed path
- B01D 33/35 with multiple filtering elements characterised by their mutual disposition
- B01D 33/44 Regenerating the filter material in the filter
- B01D 33/58 Handling the filter cake in the filter for purposes other than for regenerating
- B01D 33/7 having feed or discharge devices
- B01D 33/8 Accessories
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