Global Patent Index - EP 0951451 A4

EP 0951451 A4 2000-11-22 - SECONDARY SEWAGE TREATMENT SYSTEM

Title (en)

SECONDARY SEWAGE TREATMENT SYSTEM

Title (de)

SEKUNDÄRSYSTEM ZUR BEHANDLUNG VON ABWASSER

Title (fr)

SYSTEME AUXILIAIRE DE TRAITEMENT DES EAUX USEES

Publication

EP 0951451 A4 (EN)

Application

EP 96939629 A

Priority

  • CA 2238729 A
  • US 9618022 W
  • US 52611795 A

Abstract (en)

[origin: WO9821150A1] A secondary sewage treatment system is provided with a treatment vessel (7) disposed within a septic tank. The treatment vessel has a draft tube (9) for aerating and circulating waste liquor through the treatment vessel and through media contained within the treatment vessel. The media has one part (20) that is submerged media and another part (22) that is an unsubmerged trickle media. The operation of the draft tube circulates waste liquor within the treatment vessel through the submerged media and up through the draft tube where it is expelled and trickles down through the trickle media back into the liquor in the lower portion of the treatment vessel.

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

C02F 3/04; C02F 3/06

IPC 8 full level (invention and additional information)

C02F 3/04 (2006.01); C02F 3/06 (2006.01); C02F 3/28 (2006.01)

CPC (invention and additional information)

C02F 3/288 (2013.01); C02F 3/04 (2013.01); C02F 3/06 (2013.01); Y02W 10/15 (2015.05)

Citation (search report)

Designated contracting state (EPC)

DE DK ES FR GB IE IT SE

EPO simple patent family

WO 9821150 A1 19980522; AU 724921 B2 20001005; AU 7675996 A 19980603; CA 2238729 A1 19980522; CA 2238729 C 20020820; EP 0951451 A1 19991027; EP 0951451 A4 20001122

INPADOC legal status


2001-06-20 [18W] WITHDRAWN

- Ref Legal Event Code: 18W

- Date of withdrawal: 20010423

2001-02-28 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: NORTHWEST CASCADE STUTH, LLC

- Ref Legal Event Code: RAP1

2001-02-28 [RIN1] INVENTOR (CORRECTION)

- Ref Legal Event Code: RIN1

- Inventor name: NORTHWEST CASCADE STUTH, LLC

2000-11-22 [A4] SUPPLEMENTARY SEARCH REPORT

- Ref Legal Event Code: A4

- Effective date: 20001006

2000-11-22 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE DK ES FR GB IE IT SE

1999-10-27 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 19990512

1999-10-27 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE DK ES FR GB IE IT SE