Ryutaro Arakawa
8Patents
6h-index
12Co-inventors
56Inventor score
Filing activity: Sep 20, 1988 → Mar 20, 2007
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4962415A | IC card | Electricity | 78 | Expired |
| US5061990A | Semiconductor device and the manufacture thereof | Electricity | 31 | Expired |
| US7348766B2 | Switching power supply device | Performing Operations; Transporting | 25 | Active |
| US7115888B2 | LED driving semiconductor circuit and LED driving apparatus including the same | Emerging Cross-Sectional Technologies | 24 | Expired |
| US7638954B2 | Light emitting diode drive apparatus | Electricity | 11 | Active |
| US6021058A | PWM inverter with zero dead time and initial power supply capacitor charging | Electricity | 9 | Expired |
| US7834828B2 | Led driving semiconductor apparatus provided with controller including regulator and drain current detector of switching element block | Electricity | 5 | Active |
| US7508254B2 | Reference supply voltage circuit using more than two reference supply voltages | Physics | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.