Global Patent Index - EP 0909207 A4

EP 0909207 A4 2000-10-04 - RADIAL-FLOW FLUIDIZABLE FILTER

Title (en)

RADIAL-FLOW FLUIDIZABLE FILTER

Title (de)

FLUIDISIERBARES FILTER MIT RADIALER STRÖMUNG

Title (fr)

FILTRE FLUIDISABLE A ECOULEMENT RADIAL

Publication

EP 0909207 A4 (EN)

Application

EP 97930996 A

Priority

  • US 9708942 W
  • US 1816896 P
  • US 2367996 P

Abstract (en)

[origin: WO9744111A1] A radial-flow filter (120) employing nonbonded granular particles (56) for filtering impurities from an influent, and that can be backwashed by fluidizing the granular particles (56) to free the impurities therefrom. During a backwashing operation, a backwash liquid applies an upwardly-directed drag force on an upper portion of the granular particles (56) to lift the same into a backwash chamber (62) for fluidization. Once the top portion of the granular particles (56) of the filtration bed is fluidized, the backwash liquid applies an upward force on a subsequent portion of the granular bed, thereby fluidizing the granular particles (56) in the backwash chamber (62). Subsequent sections of the granular bed are fluidized in a similar manner to thereby completely clean the granular particles (56). After the backwash operation, the granular particles (56) fall back to the filtration chamber (156) and form a filter bed for carrying out a filtration operation.

IPC 1-7 (main, further and additional classification)

B01D 24/46; B01D 24/08; B01D 24/42

IPC 8 full level (invention and additional information)

B01D 24/08 (2006.01); B01D 35/153 (2006.01)

CPC (invention and additional information)

B01D 35/153 (2013.01); B01D 24/08 (2013.01); B01D 2201/44 (2013.01)

Combination set (CPC)

B01D 24/08 + B01D 24/42 + B01D 24/4631 + B01D 24/4668

Citation (search report)

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9744111 A1 19971127; AU 3473997 A 19971209; AU 715029 B2 20000113; CA 2256385 A1 19971127; CA 2256385 C 20051206; CN 1080131 C 20020306; CN 1226182 A 19990818; EP 0909207 A1 19990421; EP 0909207 A4 20001004; HK 1022114 A1 20021101; MX PA98010890 A 20040521

INPADOC legal status


2006-06-28 [18W] WITHDRAWN

- Ref Legal Event Code: 18W

- Effective date: 20060517

2002-06-19 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20020503

2000-10-04 [A4] SUPPLEMENTARY SEARCH REPORT

- Ref Legal Event Code: A4

- Effective date: 20000822

2000-10-04 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2000-10-04 [RIC1] CLASSIFICATION (CORRECTION)

- Ref Legal Event Code: RIC1

- Free Format Text: 7B 01D 24/46 A, 7B 01D 24/08 B, 7B 01D 24/42 B

1999-04-21 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 19981222

1999-04-21 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE