EP1524757A3
Negative charge pump
Abstract
A negative charge pump is disclosed. The negative charge pump may be used to drive white LEDs in one application. The negative charge pump uses predominantly n-channel transistor switches that enables a smaller integrated circuit area. Further, a soft start mechanism is used in starting the charge pump.
Term
Term ended
Projected expiry passed 25 August 2024, 2.1 years ago.
- Priority
- Filed
- Published
- Projected expiry
- Today
1 sheet
Sheet 1
Every citation, both ways
| Document | Relation | Office | Category | Cited during | Relevant claims |
|---|---|---|---|---|---|
| US4897774A | Cites | United States of America | Y | Search report | 2 |
| US5237209A | Cites | United States of America | X | Search report | 1 |
| US5262934A | Cites | United States of America | XY | Search report | 1 |
| US5546296A | Cites | United States of America | Y | Search report | 3 |
| US5606491A | Cites | United States of America | X | Search report | 1 |
8 members in 6 offices; this record represents the family
Priority claims2
| Document | Office | Kind | Date |
|---|---|---|---|
| 685132 | United States of America | – | |
| 68513203 | United States of America | A |
Members8
| Document | Office | Kind | |
|---|---|---|---|
| US2005077950A1 | United States of America | A1 | |
| EP1524757A2 | European Patent Office (EPO) | A2 | |
| KR20050036739A | Republic of Korea | A | |
| TW200515832A | Taiwan Province of China | A | |
| JP2005124392A | Japan | A | |
| CN1627615A | China | A | |
| EP1524757A3This record | European Patent Office (EPO) | A3 | |
| TWI269510B | Taiwan Province of China | B |
9 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Application deemed to be withdrawnWithdrawn18D | 18D | |
| Information on the status of an ep patent application or granted ep patentGrantedSTATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWNSTAA | STAA | |
| Designation fees paidAKX | AKX | |
| Designated contracting statesAK | AK | |
| Request for extension of the european patentAX | AX | |
| Search report despatchedORIGINAL CODE: 0009013PUAL | PUAL | |
| Designated contracting statesAK | AK | |
| Request for extension of the european patentAX | AX | |
| Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI | PUAI |
Numbers
- Publication
- 1524757
- Application
- 42551069
Titles3
- German
- Ladungspumpe für negative Spannung
- English
- Negative charge pump
- French
- Pompe de cherge négative
Classification
- CPC, 4
- H02M3/07
- H02M3/00
- H02M1/36
- H02M3/071
- IPC, 4
- H02M3 07
- H02M3 00
- H10D84 00
- H10D84 03
Designated states2
- Contracting states, 1
- Türkiye
- Extension states, 1
- North Macedonia