Takashi Yamakawa
66Patents
8h-index
53Co-inventors
81Inventor score
Filing activity: Nov 15, 1984 → Dec 28, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US8261540B2 | Particulate matter sensor and exhaust gas purification apparatus | Emerging Cross-Sectional Technologies | 22 | Active |
| US6651458B1 | Internal intermediate pressure 2-stage compression type rotary compressor | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US6616428B2 | Double-cylinder two-stage compression rotary compressor | Mechanical Engineering; Lighting; Heating | 19 | Expired |
| US6568198B1 | Multi-stage compression refrigerating device | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US6318981A | Two-cylinder type two-stage compression rotary compressor | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US9225258B2 | Backflow preventing means, power converting device, and refrigerating and air-conditioning apparatus | Emerging Cross-Sectional Technologies | 14 | Active |
| US6581408B1 | Multi-stage compression refrigerating device | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US9431915B2 | Power conversion apparatus and refrigeration air-conditioning apparatus | Emerging Cross-Sectional Technologies | 12 | Active |
| US10038769B2 | Sound emission and collection device, and sound emission and collection method | Electricity | 6 | Active |
| US9240736B2 | Power converting device, motor driving device, and refrigerating and air-conditioning apparatus | Emerging Cross-Sectional Technologies | 6 | Active |
| US4583568A | Valve assembly for powdery granules | Emerging Cross-Sectional Technologies | 5 | Expired |
| US9746216B2 | Heat pump device, heat pump system, air conditioner, and freezer | Emerging Cross-Sectional Technologies | 5 | Active |
| US10686397B2 | Motor system, motor drive device, refrigeration cycle device, and air conditioner | Electricity | 4 | Active |
| US7974424B2 | Speaker array system | Electricity | 3 | Active |
| US9685800B2 | Charging/discharging system | Emerging Cross-Sectional Technologies | 3 | Active |
| US11005410B2 | Motor driving apparatus | Mechanical Engineering; Lighting; Heating | 2 | Active |
| US8275160B2 | Delay time calculation apparatus, delay time calculation method, and storage medium storing program therefor | Electricity | 2 | Active |
| US9825488B2 | Power supply switching device and switch board | Emerging Cross-Sectional Technologies | 2 | Active |
| US8856136B2 | Information update system | Physics | 2 | Active |
| US9825575B2 | Power converting apparatus, dehumidifier, air conditioner, and refrigeration apparatus | Emerging Cross-Sectional Technologies | 2 | Active |
| US10465965B2 | Heat pump apparatus, and air conditioner, heat pump water heater, and refrigerator including the heat pump apparatus | Mechanical Engineering; Lighting; Heating | 2 | Active |
| US10833598B2 | Power conversion device, motor drive control device, blower, compressor, and air conditioner | Emerging Cross-Sectional Technologies | 1 | Active |
| US9742267B2 | Power conversion apparatus and refrigeration air-conditioning apparatus | Emerging Cross-Sectional Technologies | 1 | Active |
| US11005404B2 | Motor driving apparatus | Electricity | 1 | Active |
| US9807215B2 | Sound emission and collection device, and sound emission and collection method | Electricity | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.