Seiichi Ishikawa
18Patents
7h-index
28Co-inventors
66Inventor score
Filing activity: Jul 7, 1981 → Sep 29, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4888808A | Digital equalizer apparatus enabling separate phase and amplitude characteristic modification | Electricity | 37 | Expired |
| US4899390A | Thin speaker having an enclosure within an open portion and a closed portion | Electricity | 26 | Expired |
| US4896285A | Calculation of filter factors for digital filter | Electricity | 15 | Expired |
| US4426556A | Electrodynamic loudspeaker | Electricity | 13 | Expired |
| US5073946A | Thin speaker having an enclosure with an open portion and a closed portion | Electricity | 11 | Expired |
| US5023913A | Apparatus for changing a sound field | Electricity | 11 | Expired |
| US5636034A | Data transmitting/receiving apparatus operating in a user-selected one of a line specifying mode and a free-line searching mode | Electricity | 7 | Expired |
| US5051942A | Method and apparatus for calculating filter factors | Electricity | 6 | Expired |
| US8586467B2 | Method of mounting electronic component and mounting substrate | Electricity | 4 | Active |
| US9805998B2 | Liquid sealing material and electronic component using same | Electricity | 4 | Active |
| US4722009A | Tone restoring apparatus | Physics | 4 | Expired |
| US4484383A | Method of manufacturing a speaker diaphragm | Emerging Cross-Sectional Technologies | 2 | Expired |
| US6005671A | Facsimile system | Electricity | 2 | Expired |
| US8499925B2 | Conveying roller and method of making the same | Performing Operations; Transporting | 1 | Active |
| US8981233B2 | Conductive member and method for producing the same | Emerging Cross-Sectional Technologies | 1 | Active |
| US8698002B2 | Conductive member and method for producing the same | Emerging Cross-Sectional Technologies | 0 | Active |
| US9748158B2 | Liquid sealing material and electronic component using same | Electricity | 0 | Active |
| US11905614B2 | Terminal material for connector | Chemistry; Metallurgy | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.