Hirohito Yamada
20Patents
7h-index
13Co-inventors
66Inventor score
Filing activity: Nov 1, 1993 → Jun 12, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6363097B1 | Semiconductor laser with a rewritable wavelength stabilizer | Electricity | 42 | Expired |
| US5394429A | Distributed-feedback laser with improved analog modulation distortion characteristics and method for fabricating the same | Electricity | 19 | Expired |
| US6416575B2 | Photonic crystal multilayer substrate and manufacturing method thereof | Physics | 18 | Expired |
| US6631236B2 | Photonic crystal waveguide and directional coupler using the same | Performing Operations; Transporting | 13 | Expired |
| US5511089A | Semiconductor laser element with excellent high-temperature characteristic and capable of being readily mounted on an optical circuit board | Electricity | 9 | Expired |
| US5887012A | Semiconductor laser array | Electricity | 9 | Expired |
| US7376317B2 | Waveguide structure and method of manufacturing the same | Physics | 7 | Expired |
| US5469459A | Laser diode element with excellent intermodulation distortion characteristic | Electricity | 6 | Expired |
| US5693965A | Laser diode having narrowed radiation angle characteristic | Electricity | 6 | Expired |
| US5661580A | SCM type of optical signal transmission system without clipping distortion | Electricity | 5 | Expired |
| US5568505A | Laser diode element with excellent intermodulation distortion characteristic | Electricity | 5 | Expired |
| US5828058A | Optical fiber remote sensing system with electromagnetic wave measurement | Physics | 4 | Expired |
| US8374469B2 | Optical waveguide | Physics | 4 | Active |
| US7359606B2 | Photonic crystal optical circuit and method for controlling the same | Physics | 3 | Expired |
| US7715665B2 | Photonic crystal optical circuit and method for controlling the same | Physics | 2 | Active |
| US7286738B2 | White light pulse generating method using nonlinear optical device | Physics | 2 | Expired |
| US5553090A | Semiconductor multiquantum well structure and semiconductor laser therewith | Electricity | 2 | Expired |
| US6541951B2 | Optical measurement of target-light waveform | Electricity | 2 | Expired |
| US8494023B2 | Composite optical waveguide, variable-wavelength laser, and method of oscillating laser | Electricity | 1 | Active |
| US12424848B2 | Power system | Electricity | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.