Liquid developer compositions
Abstract
Disclosed is an electrophotographic liquid developer composition comprising a liquid medium, first toner particles able to be charged to one polarity and comprising a first dye and polymeric cores to which steric stabilizer polymers have been attached, second toner particles able to be charged to a polarity opposite to that of the first toner particles and comprising a second dye of a different color from that of the first dye and polymeric cores to which steric stabilizer polymers have been attached, and a charge director. The disclosed developer is suitable for developing electrostatic latent images in two different colors in a single development step. The latent image comprises three areas of charge; toner particles of one color are selectively attracted to one area, toner particles of the other color are selectively attracted to the second area, and the third area remains undeveloped as a background area.
Term
Term ended
Projected expiry passed 23 May 2009, 17.3 years ago.
- Priority
- Filed
- Published
- Projected expiry
- Today
Every citation, both ways
| Document | Relation | Office | Category | Cited during |
|---|---|---|---|---|
| US3990980A | Cites | United States of America | A | Search report |
| US4476210A | Cites | United States of America | AD | Search report |
3 priority claims, no other members on record
Priority claims3
| Document | Office | Kind | Date |
|---|---|---|---|
| 197130 | United States of America | – | |
| 19713088 | United States of America | A | |
| US19880197130 | – | – | – |
21 legal events, as 2 offices reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | Office | |
|---|---|---|---|
| Notification of lapseLapsedST | ST | FR | |
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | EP | |
| Gb: european patent ceased through non-payment of renewal feeCeasedGBPC | GBPC | EP | |
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | EP | |
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | 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 | |
| No opposition filedOpposition26N | 26N | EP | |
| No opposition filed within time limitOppositionORIGINAL CODE: 0009261PLBE | PLBE | EP | |
| Information on the status of an ep patent application or granted ep patentGrantedSTATUS: NO OPPOSITION FILED WITHIN TIME LIMITSTAA | STAA | EP | |
| Corresponds to:REF | REF | EP | |
| Fr: translation filedET | ET | EP | |
| Designated contracting statesAK | AK | EP | |
| (expected) grantORIGINAL CODE: 0009210GRAA | GRAA | EP | |
| First examination report despatched17Q | 17Q | EP | |
| Request for examination filed17P | 17P | 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
- 0343924
- Publication, DOCDB
- 0343924
- Publication, EPODOC
- EP0343924
- Application
- 305202
- Application, DOCDB
- 89305202
- Application, EPODOC
- EP19890305202
Titles3
- English
- Liquid developer compositions
- German
- Flüssige Entwicklerzusammensetzungen
- French
- Compositions de développateur liquides
Classification
- CPC, 5
- G03G9/122
- G03G9/12
- G03G13/013
- Y10S430/105
- G03G15/0121
- IPC, 3
- G03G9 12
- G03G9 13
- G03G13 01
Designated states3
- Contracting states, 3
- Germany
- France
- United Kingdom