NEC Viewtechnology, Ltd.
125Patents
39Active
125Granted
46Portfolio score
Filing activity: Mar 24, 1999 → Jun 1, 2012 · 38 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6819939B2 | Cellular phone with high-quality sound reproduction capability | Electricity | 198 | Expired |
| US6886942B2 | Projector with light source having variable brightness based on detected temperature information | Electricity | 137 | Expired |
| US7070281B2 | Light source device and projection display | Electricity | 91 | Expired |
| US6698891B2 | Polarizing unit, polarizing illumination device using same polarizing unit and projection display device using same polarizing illumination device | Physics | 68 | Expired |
| US6513935B2 | Lens-less projection optical system of reflection type | Electricity | 54 | Expired |
| US7880721B2 | Wave receiving device and method of determining wave reception | Physics | 48 | Active |
| US6846081B2 | Projector | Electricity | 46 | Expired |
| US6771427B1 | Image-forming optical system | Physics | 31 | Expired |
| US6950240B2 | Imaging optical system | Physics | 29 | Expired |
| USD504453S1 | Projector | General | 29 | Expired |
| US6644814B2 | LED-illumination-type DMD projector and optical system thereof | Physics | 26 | Expired |
| US6877862B2 | Projector | Physics | 24 | Expired |
| US6547402B2 | Projection lens shifting mechanism | Electricity | 24 | Expired |
| US7690797B2 | Projector and focus adjustment method | Electricity | 24 | Active |
| US7185987B2 | Projector and projector accessory | Electricity | 23 | Expired |
| US6491398B2 | Video projector | Electricity | 22 | Expired |
| US6877864B1 | Projector and method of correcting image distortion | Physics | 21 | Expired |
| US6574046B1 | Reflective time-division image projector | Electricity | 19 | Expired |
| US8086704B2 | Projector selection system, projector selection method, and program for implementing the system and method | Electricity | 18 | Active |
| US6687453B1 | Digital image reproducing apparatus and method | Electricity | 17 | Expired |
| US6494581B2 | Lamp house and projector device thereof | Physics | 16 | Expired |
| US6597409B1 | Video projector | Electricity | 15 | Expired |
| US7104653B2 | System for correcting approximate expressions used in geometrical correction of projected images | Physics | 15 | Expired |
| US6733137B2 | Digital mirror device projector and method of correcting video signal being used in digital mirror device projector | Electricity | 14 | Expired |
| USD500070S1 | Projector | General | 13 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.