Drive circuit of plasma display device
US7633497B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 2004 |
| Grant date | Dec 15, 2009 |
| Priority date | — |
| Expiry date | Jul 1, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/294
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An air purifier includes a main body defining an air passage therein to allow sucked air to pass therethrough prior to being discharged, and a first filter installed in the main body to be switched between a closed state and an open state. The first filter removes contaminants from the sucked air in the closed state, and allows the sucked air to pass through the air passage in the open state. The air purifier may include a main body to suck and discharge air, with a bypass passage formed in the main body so that the bypass passage is opened or closed by a door, and a first filter installed in the main body. The sucked air passes through the first filter prior to being discharged when the door is closed, and passes through the bypass passage prior to being discharged when the door is opened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.