Takami Hirai
38Patents
12h-index
28Co-inventors
81Inventor score
Filing activity: Jul 22, 1991 → Nov 4, 2013
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6542050B1 | Transmitter-receiver | Electricity | 169 | Expired |
| US5232765A | Distributed constant circuit board using ceramic substrate material | Emerging Cross-Sectional Technologies | 148 | Expired |
| US6828881B2 | Stacked dielectric filter | Electricity | 146 | Expired |
| US5608364A | Layered stripline filter including inductive coupling adjustment strip | Electricity | 27 | Expired |
| US5373271A | Dielectric filter having coupling electrodes for connecting resonator electrodes, and method of adjusting frequency characteristic of the filter | Emerging Cross-Sectional Technologies | 25 | Expired |
| US6294967A | Laminated type dielectric filter | Electricity | 21 | Expired |
| US5374909A | Stripline filter having internal ground electrodes | Electricity | 20 | Expired |
| US5448209A | Laminated dielectric filter | Electricity | 20 | Expired |
| US5497130A | Layered transmission line filter with a capacitively coupled electrode in a layer opposing stripline resonators | Electricity | 14 | Expired |
| US5344695A | Dielectric filter having coupling electrodes for connecting resonator electrodes, and method of adjusting frequency characteristic of the filter | Emerging Cross-Sectional Technologies | 14 | Expired |
| US6351239B1 | Electronic device in which integrated antenna and filter both have balanced terminals | Electricity | 13 | Expired |
| US5576672A | Layered stripline filter including capacitive coupling electrodes | Electricity | 13 | Expired |
| US6563058B2 | Multilayered circuit board and method for producing the same | Electricity | 10 | Expired |
| US5185304A | Dielectric ceramic composition of BaO, TiO.sub.2, Nd.sub.2 O.sub.3, Sm.sub.2 O.sub.3 and Bi.sub.2 O.sub.3 | Electricity | 10 | Expired |
| US8421215B2 | Laminated and sintered ceramic circuit board, and semiconductor package including the circuit board | Electricity | 10 | Active |
| US6429829B1 | Antenna device | Electricity | 9 | Expired |
| US5262595A | Dielectric ceramic body including TiO.sub.2 dispersion in crystallized cordierite matrix phase, method of producing the same, and circuit board using the same | Emerging Cross-Sectional Technologies | 8 | Expired |
| US6356244B1 | Antenna device | Electricity | 7 | Expired |
| US5412358A | Layered stripline filter | Electricity | 7 | Expired |
| US8558640B2 | Directional coupler | Electricity | 6 | Active |
| US5182240A | Dielectric ceramic composition of BaO, TiO.sub.2,Nd.sub.2 O.sub.3, Sm.sub.2 .sub.3 and Al.sub.2 O.sub.3 | Chemistry; Metallurgy | 6 | Expired |
| US6226423A | Optical waveguide element | Physics | 6 | Expired |
| US6566988B2 | Stacked type dielectric resonator | Electricity | 5 | Expired |
| US5556585A | Dielectric ceramic body including TIO2 dispersion in crystallized cordierite matrix phase, method of producing the same, and circuit board using the same | Emerging Cross-Sectional Technologies | 5 | Expired |
| US6538534B2 | Stacked type dielectric filter | Electricity | 4 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.