EP0335576A3
Pulp dewatering process
Abstract
Dry market pulp is made by shearing a cellulosic suspension and draining it through a screen to form a pulp sheet which is then dried, and the productivity of the process is increased by adding a water soluble cationic polymer before the shearing and bentonite or other suitable inorganic material after the shearing.
Term
Term ended
Projected expiry passed 22 March 2009, 17.5 years ago.
- Priority
- Filed
- Published
- Projected expiry
- Today
Every citation, both waysCites: the store holds 2 of 3
| Document | Relation | Office | Category | Cited during |
|---|---|---|---|---|
| EP0235893A1 | Cites | European Patent Office (EPO) | AD | Search report |
| CA1069742A | Cites | Canada | A | Search report |
| TAPPI PAPERMAKERS CONFERENCE, New Orleans, 14th - 16th April 1986, pages 89-92; J.G. LANGLEY et al.: "Dewatering aids for paper applications" | Non-patent | – | – | Search report |
23 members in 13 offices
Priority claims3
| Document | Office | Kind | Date |
|---|---|---|---|
| 8807445 | United Kingdom | A | |
| 8807445 | United Kingdom | – | |
| GB19880007445 | – | – | – |
Members23
| Document | Office | Kind | |
|---|---|---|---|
| GB8807445D0 | United Kingdom | D0 | |
| FI891466A0 | Finland | A0 | |
| NO891302D0 | Norway | D0 | |
| AU3174689A | Australia | A | |
| FI891466A | Finland | A | |
| FI891466L | Finland | L | |
| NO891302L | Norway | L | |
| EP0335576A2 | European Patent Office (EPO) | A2 | |
| KR890014833A | Republic of Korea | A | |
| JPH026684A | Japan | A | |
| ZA892281B | South Africa | B | |
| US4969976A | United States of America | A | |
| EP0335576A3This record | European Patent Office (EPO) | A3 | |
| AU613464B2 | Australia | B2 | |
| EP0335576B1 | European Patent Office (EPO) | B1 | |
| AT89350T | Austria | T | |
| ATE89350T1 | Austria | T1 | |
| DE68906452D1 | Germany | D1 | |
| DE68906452T2 | Germany | T2 | |
| CA1322436C | Canada | C | |
| ES2040461T3 | Spain | T3 | |
| NO174723B | Norway | B | |
| FI92724B | Finland | B |
38 legal events, as 3 offices reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | Office | |
|---|---|---|---|
| Nl: decision of oppositionOppositionNLR2 | NLR2 | EP | |
| Patent revokedRevoked27W | 27W | EP | |
| Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting stateRevoked950422GBPR | GBPR | EP | |
| Patent ceasedCeasedPL | PL | CH | |
| Patent revokedRevokedORIGINAL CODE: 0009271RDAG | RDAG | EP | |
| Information on the status of an ep patent application or granted ep patentGrantedSTATUS: PATENT REVOKEDSTAA | STAA | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Se: european patent in force in swedenEAL | EAL | EP | |
| Nl: opposition has been filed with the epoOppositionNLR1 | NLR1 | EP | |
| Nl: opposition has been filed with the epoOppositionNLR1 | NLR1 | EP | |
| Opposition filedOpposition26 | 26 | EP | |
| Opposition filedOpposition26 | 26 | EP | |
| Opposition filedOpposition26 | 26 | EP | |
| Opposition filedOppositionORIGINAL CODE: 0009260PLBI | PLBI | EP | |
| Opposition filedOppositionORIGINAL CODE: 0009260PLBI | PLBI | EP | |
| Definitive protectionFG2A | FG2A | ES | |
| Fr: translation filedET | ET | EP | |
| It: translation for a ep patent filedITF | ITF | EP | |
| It: translation for a ep patent filedITF | ITF | EP | |
| Corresponds to:REF | REF | EP | |
| Designated contracting statesAK | AK | EP | |
| Corresponds to:REF | REF | EP | |
| (expected) grantORIGINAL CODE: 0009210GRAA | GRAA | EP | |
| First examination report despatched17Q | 17Q | EP | |
| Request for examination filed17P | 17P | EP | |
| Main classification (correction)RHK1 | RHK1 | EP | |
| Designated contracting statesAK | AK | EP | |
| Search report despatchedORIGINAL CODE: 0009013PUAL | PUAL | EP | |
| Designated contracting statesAK | AK | EP | |
| Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI | PUAI | EP |
Numbers
- Publication
- 0335576
- Publication, DOCDB
- 0335576
- Publication, EPODOC
- EP0335576
- Application
- 302843
- Application, DOCDB
- 89302843
- Application, EPODOC
- EP19890302843
Titles3
- German
- Verfahren zur Entwässerung von Pulpe
- English
- Pulp dewatering process
- French
- Procédé de déshydratation de pâte
Classification
- CPC, 5
- D21C9/18
- D21H17/29
- D21H17/44
- D21H17/68
- D21H23/765
- IPC, 13
- D21H17 34
- D21C9 00
- D21C9 18
- D21H17 28
- D21H17 29
- D21H17 33
- D21H17 44
- D21H17 47
- D21H17 56
- D21H17 63
- D21H17 67
- D21H17 68
- D21H23 76
Designated states1
- Contracting states, 1
- Sweden