DIFF Subgroup
B01D 25/12 Filter presses, i.e. of the plate or plate and frame type
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Filters formed by clamping together several filtering elements or parts of such elements > Filter presses, i.e. of the plate or plate and frame type
CPC:
Filters formed by clamping together several filtering elements or parts of such elements (disc filters B01D29/39) > Filter presses, i.e. of the plate or plate and frame type
IPC and CPC are identically structured here. All 6 subcodes exist in both systems.
4 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1990.
Child Classifications
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- B01D 25/127 with one or more movable filter bands arranged to be clamped between the press plates or between a plate and a frame during filtration, e.g. zigzag endless filter bands (B01D25/172, B01D25/176, B01D25/19 take precedence) since 1990 +1 CPC −1 IPC IPC+CPC Available in IPC and CPC
- B01D 25/164 Chamber-plate presses, i.e. the sides of the filtering elements being clamped between two successive filtering plates (B01D25/127, B01D25/172, B01D25/176, B01D25/19 take precedence) since 1990 +1 CPC −1 IPC IPC+CPC Available in IPC and CPC
- B01D 25/172 Plate spreading means (removal of filter cakes B01D25/32) since 1990 IPC+CPC Available in IPC and CPC
- B01D 25/176 attaching the filter element to the filter press plates, e.g. around the central feed hole in the plates since 1990 IPC+CPC Available in IPC and CPC
- B01D 25/19 Clamping means for closing the filter press, e.g. hydraulic jacks since 1990 IPC+CPC Available in IPC and CPC
- B01D 25/21 Plate and frame presses (B01D25/172, B01D25/176, B01D25/19 take precedence) since 1990 +1 CPC IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
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
Top Applicants (CPC)
Class B01,2013–2023, worldwide · Source: EPO PATSTAT
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 10,345
- CHINESE ACADEMY OF SCIENCES 8,352
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 5,134
- LG CHEM KR 4,290
- SAUDI ARABIAN OIL COMPANY SA 3,444
- IFPEN (IFP ENERGIES NOUVELLES) FR 3,417
- DOW GLOBAL TECHNOLOGIES US 3,195
- MANN + HUMMEL DE 2,822
- JOHNSON MATTHEY GB 2,802
- UNIVERSAL OIL PRODUCTS COMPANY (UOP) US 2,737