Takuya Fujii
33Patents
7h-index
44Co-inventors
69Inventor score
Filing activity: Nov 15, 1988 → Jul 17, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4980204A | Metal organic chemical vapor deposition method with controlled gas flow rate | Emerging Cross-Sectional Technologies | 98 | Expired |
| US5987046A | Optical semiconductor device and a method of manufacturing the same | Emerging Cross-Sectional Technologies | 54 | Expired |
| US6034983A | Method of fabricating compound semiconductor device and optical semiconductor device | Emerging Cross-Sectional Technologies | 20 | Expired |
| US6238943A | Optical semiconductor device and a method of manufacturing the same | Emerging Cross-Sectional Technologies | 18 | Expired |
| US6710378B1 | Semiconductor light reception device of end face light incidence type | Electricity | 17 | Expired |
| US5937273A | Fabricating compound semiconductor by varying ratio of stagnant layer thickness and mean free path of seed material | Emerging Cross-Sectional Technologies | 13 | Expired |
| US8588266B2 | Wavelength tunable semiconductor laser having two difractive grating areas | Electricity | 9 | Active |
| US6512783B1 | Semiconductor laser and method of manufacturing the same | Electricity | 6 | Expired |
| US5952673A | Optical semiconductor device including a multiple quantum well structure of an AlGaInAs/InP system | Electricity | 6 | Expired |
| US5327450A | Optical semiconductor device and process of prodcuing same | Electricity | 5 | Expired |
| US8584809B2 | Safety device for elevator | Performing Operations; Transporting | 4 | Active |
| US7894693B2 | Optical semiconductor device and method of controlling the same | Electricity | 3 | Active |
| US6376338B2 | Manufacturing method of a semiconductor device having a diffraction grating | Electricity | 3 | Expired |
| US8672098B2 | Elevator safety device with foreign matter detection using a light beam | Performing Operations; Transporting | 2 | Active |
| US8401352B2 | Optical waveguide device, its manufacture method, laser module and optical transmission system | Electricity | 2 | Active |
| US6955994B2 | Method of manufacturing semiconductor device and method of manufacturing optical wave guide | Electricity | 2 | Expired |
| US10576700B2 | Method for producing a fiber-reinforced plastic molded article | Chemistry; Metallurgy | 1 | Active |
| US8463086B2 | Optical semiconductor device | Electricity | 1 | Active |
| US6924162B2 | Process of manufacturing a semiconductor device | Electricity | 1 | Expired |
| US9130083B2 | Semiconductor light receiving device and light receiving apparatus | Electricity | 1 | Active |
| US8009947B2 | Optical semiconductor device and method of controlling the same | Electricity | 1 | Active |
| US10591500B2 | Sample analyzer, sample analyzing method, and reagent container holder | Physics | 1 | Active |
| US7362782B2 | Optical semiconductor device and controlling method of the same | Electricity | 1 | Active |
| US8304267B2 | Laser device, laser module, semiconductor laser and fabrication method of semiconductor laser | Electricity | 0 | Active |
| US7919415B2 | Process of manufacturing a semiconductor device | Electricity | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.