Koji Oka
31Patents
8h-index
38Co-inventors
75Inventor score
Filing activity: Feb 12, 1997 → Apr 28, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6407571B1 | Voltage detecting circuit for a power system | Physics | 64 | Expired |
| US7372002B2 | Fluid heating device and cleaning device using the same | Fixed Constructions | 63 | Expired |
| US7187407B2 | Control system for image file | Electricity | 50 | Expired |
| US5970433A | Laser obstacle detection method and sensor | Physics | 31 | Expired |
| US6734817B2 | A/D converter, method of A/D conversion, and signal processing device | Electricity | 23 | Expired |
| US6310492A | CMOS semiconductor integrated circuit | Electricity | 14 | Expired |
| US7019676B2 | D/A converter | Electricity | 13 | Expired |
| US6498528B2 | Reference voltage generation circuit | Physics | 9 | Expired |
| US6700524B2 | A/D converter for performing pipeline processing | Electricity | 8 | Expired |
| US6492849B2 | Supply voltage detection circuit | Physics | 6 | Expired |
| US7920779B2 | Heat exchanger and washing apparatus comprising the same | Mechanical Engineering; Lighting; Heating | 6 | Active |
| US6866723B2 | Wet cleaning process and wet cleaning equipment | Emerging Cross-Sectional Technologies | 6 | Expired |
| US8745609B2 | Imaging system | Electricity | 5 | Active |
| US7750939B2 | Image photographing device and release device | Electricity | 4 | Active |
| US7706009B2 | Image printing control apparatus and image printing control method | Electricity | 3 | Active |
| US6806764B2 | Reference voltage generation circuit | Physics | 3 | Expired |
| US7940121B2 | Operational amplifier and pipeline AD converter | Electricity | 2 | Active |
| US7042278B2 | Voltage reference circuit with reduced power consumption | Physics | 2 | Expired |
| US7609194B2 | Clock signal generating device and analog-digital conversion device | Electricity | 2 | Active |
| US10460088B2 | Electronic device and connection method | Electricity | 2 | Active |
| US7952733B2 | Image transfer system and image transfer method | Electricity | 2 | Active |
| US8004446B2 | A/D converter and A/D conversion method | Electricity | 1 | Active |
| US10462371B2 | Imaging apparatus and imaging method for comparing a template image with a monitoring image | Electricity | 1 | Active |
| US7649487B2 | A/D converter and A/D conversion method | Electricity | 1 | Active |
| US11702836B2 | Structure for joining column and beam frame and shear wall | Fixed Constructions | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.