Masayuki Iwamatsu
30Patents
12h-index
3Co-inventors
74Inventor score
Filing activity: Jan 13, 1977 → Jan 25, 2011
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US8164388B2 | Amplifying apparatus | Electricity | 80 | Active |
| US4851842A | Analog-to-digital conversion circuit | Electricity | 53 | Expired |
| US5999630A | Sound image and sound field controlling device | Emerging Cross-Sectional Technologies | 49 | Expired |
| US4856064A | Sound field control apparatus | Electricity | 46 | Expired |
| US5027687A | Sound field control device | Emerging Cross-Sectional Technologies | 42 | Expired |
| US5046107A | Input level adjusting circuit | Electricity | 29 | Expired |
| US5524053A | Sound field control device | Electricity | 28 | Expired |
| US5680464A | Sound field controlling device | Electricity | 26 | Expired |
| US5727067A | Sound field control device | Electricity | 19 | Expired |
| US7482870B2 | Class D amplifier | Electricity | 18 | Active |
| US5040220A | Control circuit for controlling reproduced tone characteristics | Electricity | 17 | Expired |
| US4087759A | Power amplifier devices | Electricity | 15 | Expired |
| US4910515A | Digital signal processing circuit | Electricity | 12 | Expired |
| US4356452A | Class A push-pull amplifier with bias controlling circuit | Electricity | 10 | Expired |
| US4241314A | Transistor amplifier circuits | Electricity | 10 | Expired |
| US4302727A | Power amplifier having bias circuit with temperature compensation | Electricity | 10 | Expired |
| US4077012A | Amplifier devices | Electricity | 7 | Expired |
| US4476442A | Amplifier with distortion cancellation | Electricity | 7 | Expired |
| US4745298A | Signal selection circuit | Physics | 6 | Expired |
| US4121169A | Amplifier device | Electricity | 5 | Expired |
| US8050425B2 | Audio signal supplying device, parameter providing system, television set, AV system, speaker apparatus, and audio signal supplying method | Electricity | 3 | Active |
| US4217555A | Amplifier circuit arrangement with stabilized power-supply current | Electricity | 3 | Expired |
| US4899150A | Digital signal processing circuit | Electricity | 2 | Expired |
| US8149057B2 | Signal processing circuit | Electricity | 2 | Active |
| US7961011B2 | Amplifier | Electricity | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.