Yuichi Handa
44Patents
12h-index
32Co-inventors
81Inventor score
Filing activity: Dec 27, 1983 → Jul 26, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6008675A | Polarization-mode selective semiconductor laser with a bending channel stripe, apparatus including the same and optical communication system using the same | Electricity | 62 | Expired |
| US4776661A | Integrated optical device | Electricity | 59 | Expired |
| US4887255A | Integrated optical head | Physics | 48 | Expired |
| US5901166A | Oscillation polarization mode selective semiconductor laser, light transmitter and optical communication system using the laser | Electricity | 39 | Expired |
| US4815027A | Optical operation apparatus for effecting parallel signal processing by detecting light transmitted through a filter in the form of a matrix | Electricity | 37 | Expired |
| US4707059A | Integrated optical circuit element and method of making the same | Physics | 23 | Expired |
| US5379142A | Demultiplexing apparatus and optical communication system using the demultiplexing apparatus | Physics | 18 | Expired |
| US6334014A | Optical fiber apparatus provided with demultiplexing/multiplexing unit on fiber's end portion, optical detecting apparatus provided with demultiplexing/multiplexing unit on its light receiving surface, and optical transmission system using the same | Physics | 17 | Expired |
| US4935930A | Laser light source for generating beam collimated in at least one direction | Electricity | 16 | Expired |
| US5926497A | Diffraction grating with alternately-arranged different regions, optical semiconductor device with the diffraction grating, and apparatus and optical communication system using the same | Electricity | 13 | Expired |
| US5369719A | Optical device with an optical coupler for effecting light branching and/or combining and an optical amplifier | Electricity | 13 | Expired |
| US5239410A | Method and apparatus for light amplification exhibiting a flat gain spectrum | Electricity | 13 | Expired |
| US5239600A | Optical device with an optical coupler for effecting light branching/combining by splitting a wavefront of light | Electricity | 11 | Expired |
| US5862165A | Variable wavelength light source using a laser, wavelength control method, optical communication system and optical communication method | Electricity | 8 | Expired |
| US4793675A | Element having light waveguides and method of making same | Physics | 7 | Expired |
| US10224826B2 | Control apparatus determining transformer magnetization in a DC/DC converter based on difference between primary and secondary currents | Electricity | 4 | Active |
| US10374517B2 | Apparatus for controlling power converter | Emerging Cross-Sectional Technologies | 4 | Active |
| US10615680B2 | Control apparatus for power converter | Emerging Cross-Sectional Technologies | 2 | Active |
| US10848068B2 | Power conversion system control device and control system | Emerging Cross-Sectional Technologies | 2 | Active |
| US10232735B2 | Control device for power supply system | Emerging Cross-Sectional Technologies | 2 | Active |
| US10637370B2 | Apparatus for controlling DC-AC converter to reduce distortions in output current | Emerging Cross-Sectional Technologies | 2 | Active |
| US10491136B2 | Bridge-less type electric power conversion device having current detection circuit of current transformer type | Electricity | 2 | Active |
| US11916494B2 | Controller for DC to AC conversion device for reducing distorting of output current | Emerging Cross-Sectional Technologies | 1 | Active |
| US10432100B2 | Electric power conversion device | Electricity | 1 | Active |
| US10075059B2 | Current detection apparatus and power conversion apparatus | Emerging Cross-Sectional Technologies | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.