Yasuji Seko
28Patents
9h-index
21Co-inventors
71Inventor score
Filing activity: Feb 6, 1992 → Jul 24, 2009
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5425041A | Multiquantum barrier laser having high electron and hole reflectivity of layers | Electricity | 92 | Expired |
| US6222866A | Surface emitting semiconductor laser, its producing method and surface emitting semiconductor laser array | Electricity | 54 | Expired |
| US8170329B2 | Position measuring system, position measuring method and computer readable medium | Physics | 36 | Active |
| US6597017B1 | Semiconductor device, surface emitting semiconductor laser and edge emitting semiconductor laser | Electricity | 31 | Expired |
| US6262540A | Semiconductor device and image formation apparatus using same | Electricity | 21 | Expired |
| US5978403A | Two-dimensional device array, two-dimensional surface light emitting laser array and image forming apparatus | Electricity | 17 | Expired |
| US5809052A | Semiconductor laser array driving method, semiconductor laser array driving device and image forming apparatus | Electricity | 14 | Expired |
| US7009713B2 | Optical position measuring system using an interference pattern | Physics | 13 | Expired |
| US5880766A | Apparatus for correcting positional deviation of light source emitting light beams in image recording apparatus | Electricity | 12 | Expired |
| US6320891A | Surface emitting semiconductor laser | Electricity | 9 | Expired |
| US6985236B2 | Position measurement system | Physics | 8 | Expired |
| US5253265A | Semiconductor laser device | Electricity | 8 | Expired |
| US5963242A | Image recording apparatus with an array light source | Performing Operations; Transporting | 7 | Expired |
| US7360708B2 | Information processing method and system using terminal apparatus | Physics | 7 | Expired |
| US5588016A | Semiconductor laser device | Electricity | 5 | Expired |
| US7633628B2 | Optical lens system and position measurement system using the same | Physics | 4 | Active |
| US7554676B2 | Positional measurement system and lens for positional measurement | Physics | 4 | Active |
| US5990494A | Optoelectro transducer array, and light-emitting device array and fabrication process thereof | Performing Operations; Transporting | 4 | Expired |
| US7274461B2 | Optical lens system and position measurement system using the same | Physics | 3 | Expired |
| US7583388B2 | Position measurement system | Physics | 3 | Active |
| US7742895B2 | Position measurement system, position measurement method and computer readable medium | Physics | 3 | Active |
| US5648295A | Method of making a semiconductor laser device | Electricity | 2 | Expired |
| US7830605B2 | Longitudinal interference fringe pattern projection lens, optical system, and three-dimensional image acquisition apparatus | Physics | 2 | Active |
| US7791736B2 | Position measurement system | Physics | 2 | Active |
| US7562821B2 | Position measurement system | Physics | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.