Inventor · disambiguated record
Keiichi Ohata
Also filed as: OHATA KEIICHI
27 granted patents·8 pending applications·718 citations·filing 1973–2025
97Inventor score
Top patents by PatentIndex Score
35 records- 0196US6320543B1Microwave and millimeter wave circuit apparatusNEC CORP·Filed 2000·Granted Nov 20, 2001·136 cites·19 claims
- 0295US6774748B1RF package with multi-layer substrate having coplanar feed through and connection interfaceNEC CORP·Filed 2000·Granted Aug 10, 2004·125 cites·7 claims
- 0394US6674347B1Multi-layer substrate suppressing an unwanted transmission modeNEC CORP·Filed 2000·Granted Jan 6, 2004·70 cites·25 claims
- 0494US4727403ADouble heterojunction semiconductor device with injectorNEC CORP·Filed 1986·Granted Feb 23, 1988·105 cites·11 claims
- 0590US6518864B1Coplanar transmission lineNEC CORP·Filed 2000·Granted Feb 11, 2003·63 cites·13 claims
- 0688US7170373B2Dielectric waveguide filterNEC CORP·Filed 2003·Granted Jan 30, 2007·26 cites·8 claims
- 0781US4556895AField-effect transistor having a channel region of a Group III-V compound semiconductor and a Group IV semiconductorNEC CORP·Filed 1983·Granted Dec 3, 1985·32 cites·25 claims
- 0878US6903700B2High frequency circuit substrate and method for forming the sameNEC CORP·Filed 2002·Granted Jun 7, 2005·23 cites·51 claims
- 0976US7196598B2Dielectric waveguide filter with inductive windows and coplanar line couplingNEC CORP·Filed 2001·Granted Mar 27, 2007·12 cites·15 claims
- 1075US7710216B2Balun circuit and integrated circuit deviceNEC CORP·Filed 2006·Granted May 4, 2010·7 cites·19 claims
- 1173US8045580B2Band control method and communication apparatusNEC CORP·Filed 2006·Granted Oct 25, 2011·5 cites·20 claims
- 1270US7378925B2Dielectric resonator, dielectric resonator frequency adjusting method, and dielectric resonator integrated circuitNEC CORP·Filed 2004·Granted May 27, 2008·11 cites·19 claims
- 1366US2025347702A1Method for testing for kidney diseasesCMIC HOLDINGS CO LTD·Filed 2025·Application pending·0 cites
- 1465US6437654B2Substrate-type non-reciprocal circuit element and integrated circuit having multiple ground surface electrodes and co-planar electrical interfaceNEC CORP·Filed 1998·Granted Aug 20, 2002·16 cites·27 claims
- 1558US4903091AHeterojunction transistor having bipolar characteristicsNEC CORP·Filed 1988·Granted Feb 20, 1990·17 cites·3 claims
- 1655US4839703AHigh speed and power transistorNEC CORP·Filed 1987·Granted Jun 13, 1989·15 cites·2 claims
- 1754US5111256AHigh speed semiconductor device and an optelectronic deviceNEC CORP·Filed 1989·Granted May 5, 1992·14 cites·12 claims
- 1852US2022034909A1Method and kit for quantifying liver-type fatty acid binding protein, method and kit for testing for kidney diseases, and companion diagnostic drugCMIC HOLDINGS CO LTD·Filed 2019·Application pending·0 cites
- 1950US5026655AProcess of fabricating a heterojunction field effect transistorNEC CORP·Filed 1989·Granted Jun 25, 1991·10 cites·6 claims
- 2049US12262638B2Tubular heat exchanger with thermoelectric power generation functionE THERMOGENTEK CO LTD·Filed 2020·Granted Mar 25, 2025·0 cites·7 claims
- 2149US4948751AMoelcular beam epitaxy for selective epitaxial growth of III - V compound semiconductorNEC CORP·Filed 1988·Granted Aug 14, 1990·16 cites·21 claims
- 2247US2024180035A1Thermoelectric power generation systemE THERMOGENTEK CO LTD·Filed 2022·Application pending·0 cites
- 2346US11674733B2Cold insulation containerE THERMOGENTEK CO LTD·Filed 2019·Granted Jun 13, 2023·0 cites·5 claims
- 2442US2022238778A1Tubular heat exchanger with thermoelectric power generation function and its manufacturing method and thermoelectric power generation device using the sameE THERMOGENTEK CO LTD·Filed 2020·Application pending·0 cites
- 2541US4893155AHeterojunction field effect transistor device and process of fabrication thereofGEN ELECTRIC·Filed 1988·Granted Jan 9, 1990·7 cites·5 claims
- 2640US12274170B2Thermoelectric power-generation module, wearable biological-body-sensing device, biological-body location detection systemE THERMOGENTEK CO LTD·Filed 2020·Granted Apr 8, 2025·0 cites·6 claims
- 2740US3936524AProcess for preparing polyisobutylene oxide moldings of excellent workabilityDAICEL LTD·Filed 1973·Granted Feb 3, 1976·3 cites·7 claims
- 2838US7113060B2Dielectric waveguide filter with inductive windows and coplanar line couplingNEC CORP·Filed 2001·Granted Sep 26, 2006·0 cites·14 claims
- 2938US4006208AProcess for manufacturing elastic hard fibersDAICEL LTD·Filed 1975·Granted Feb 1, 1977·3 cites·9 claims
- 3038US2006244671A1Feeder waveguide and sector antennaNEC CORP·Filed 2004·Application pending·0 cites
- 3135US2024147857A1Thermoelectric power generation systemE THERMOGENTEK CO LTD·Filed 2021·Application pending·0 cites
- 3235US2006044055A1Negative-resistance circuit and active filterITO MASAHARU·Filed 2003·Application pending·0 cites
- 3331US4837605AIndium-phosphide hetero-MIS-gate field effect transistorNEC CORP·Filed 1987·Granted Jun 6, 1989·2 cites·8 claims
- 3430US10680154B2Thermoelectric conversion module, method for producing same, thermoelectric power generation system, and method for producing sameE THERMOGENTEK CO LTD·Filed 2016·Granted Jun 9, 2020·0 cites·6 claims
- 3530US2002093392A1Microwave-millimeter wave circuit apparatus and fabrication method thereof having a circulator or isolatorFiled 1999·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →