KDD Corporation
54Patents
1Active
54Granted
37Portfolio score
Filing activity: Aug 26, 1998 → Oct 6, 2005 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6473459B1 | Scene change detector | Electricity | 89 | Expired |
| US6460087B1 | Method of transferring file | Electricity | 76 | Expired |
| US6301577A | Similar document retrieval method using plural similarity calculation methods and recommended article notification service system using similar document retrieval method | Emerging Cross-Sectional Technologies | 72 | Expired |
| US6522667B1 | Network interworking device for IP network / ATM network | Electricity | 53 | Expired |
| US6532091B1 | Optical digital regenerator | Electricity | 49 | Expired |
| US6791998B1 | Polling period controlling apparatus | Electricity | 42 | Expired |
| US6430224B1 | Stereo video data coding apparatus | Electricity | 30 | Expired |
| US6526261B1 | Control method of transmitting power in cellular system | Electricity | 27 | Expired |
| US6976070B1 | Method and apparatus for automatic information filtering using URL hierarchical structure and automatic word weight learning | Emerging Cross-Sectional Technologies | 26 | Expired |
| US6348954B1 | Optimum motion vector determinator and video coding apparatus using the same | Electricity | 21 | Expired |
| US6115173A | Optical amplifying transmission system and optical amplifier | Electricity | 20 | Expired |
| US6459518B1 | Optical transmitting apparatus | Electricity | 19 | Expired |
| US6188508A | Control signal superimposer | Electricity | 19 | Expired |
| US6118806A | Signal synthesis method and apparatus under diversity reception | Electricity | 19 | Expired |
| US6701373B1 | Data transmission apparatus | Electricity | 17 | Expired |
| US6587435B1 | Apparatus for high speed communication on asymmetric line | Electricity | 17 | Expired |
| US6351649B1 | Mobile communication system | Electricity | 14 | Expired |
| US6594003B1 | Measuring system of transmission characteristics | Physics | 14 | Expired |
| US6232927A | Array antenna apparatus for use in spread spectrum communications with a particular interval between antenna elements | Electricity | 13 | Expired |
| US6377299B1 | Video quality abnormality detection method and apparatus | Electricity | 13 | Expired |
| US6594428B1 | Dispersion compensating optical transmission line and system | Electricity | 13 | Expired |
| US6434288B1 | Optical switching system | Electricity | 12 | Expired |
| US6377375B1 | Optical wavelength division multiplexed signal amplifying repeater and optical communication transmission line with very large capacity | Electricity | 11 | Expired |
| US7380015B1 | Apparatus and method for compression-transmitting and decoding picture information and storage medium stored its control programs | Electricity | 10 | Expired |
| US6020991A | Optical amplifier | Electricity | 9 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.