Inventor · disambiguated record
Akira Yamakawa
Also filed as: YAMAKAWA AKIRA
100 granted patents·2 pending applications·1,638 citations·filing 1981–2019
99Inventor score
Files withSUMITOMO ELECTRIC INDUSTRIES92DAICEL CORP7AGENCY IND SCIENCE TECHN1JAPAN ATOMIC ENERGY RES INST1SUMITOMO ELECTRIC IND LTD I1
Top patents by PatentIndex Score
102 records- 0195US6284690B1Si3N4 ceramic, Si-base composition for production thereof and processes for producing theseSUMITOMO ELECTRIC INDUSTRIES·Filed 1996·Granted Sep 4, 2001·96 cites·14 claims
- 0293US5599493AMethod of producing silicon nitride ceramic componentSUMITOMO ELECTRIC INDUSTRIES·Filed 1995·Granted Feb 4, 1997·94 cites·16 claims
- 0390US5373157AQuadrupole electrode and process for producing the sameJAPAN ATOMIC ENERGY RES INST·Filed 1992·Granted Dec 13, 1994·62 cites·10 claims
- 0487US5776600ASlide member and method of manufacturing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1996·Granted Jul 7, 1998·47 cites·26 claims
- 0585US5904993AJoint body of aluminum and silicon nitride and method of preparing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1995·Granted May 18, 1999·53 cites·20 claims
- 0685US5675201AComposite bearing structureSUMITOMO ELECTRIC INDUSTRIES·Filed 1994·Granted Oct 7, 1997·43 cites·23 claims
- 0785US5280208AComposite bearing structureSUMITOMO ELECTRIC INDUSTRIES·Filed 1992·Granted Jan 18, 1994·45 cites·41 claims
- 0884US5767026ASilicon nitride ceramic and process for forming the sameAGENCY IND SCIENCE TECHN·Filed 1995·Granted Jun 16, 1998·56 cites·8 claims
- 0984US5356842AComposite ceramic powder and production process thereofSUMITOMO ELECTRIC INDUSTRIES·Filed 1993·Granted Oct 18, 1994·40 cites·22 claims
- 1079US5369065ASilicon nitride sintered body and process for producing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1993·Granted Nov 29, 1994·32 cites·3 claims
- 1178US5229549ACeramic circuit board and a method of manufacturing the ceramic circuit boardSUMITOMO ELECTRIC INDUSTRIES·Filed 1991·Granted Jul 20, 1993·62 cites·4 claims
- 1276US5750449ACeramic porous bodies and method of producing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1996·Granted May 12, 1998·27 cites·2 claims
- 1375US4965044AMethod of sintering ceramics and metal dispersed reinforced ceramics obtained therebySUMITOMO ELECTRIC IND LTD I·Filed 1989·Granted Oct 23, 1990·25 cites·6 claims
- 1474US4660114AThin film magnetic heads and substrates thereforeSUMITOMO ELECTRIC INDUSTRIES·Filed 1985·Granted Apr 21, 1987·19 cites·2 claims
- 1572US5352641ASilicon nitride composite sintered body and process for producing sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1992·Granted Oct 4, 1994·24 cites·12 claims
- 1671US5297365AMethod of machining silicon nitride ceramics and silicon nitride ceramics productsSUMITOMO ELECTRIC INDUSTRIES·Filed 1992·Granted Mar 29, 1994·20 cites·2 claims
- 1771US4886709AMember for semiconductor apparatusSUMITOMO ELECTRIC INDUSTRIES·Filed 1988·Granted Dec 12, 1989·38 cites·9 claims
- 1870US5502011ASilicon nitride sintered bodySUMITOMO ELECTRIC INDUSTRIES·Filed 1994·Granted Mar 26, 1996·21 cites·2 claims
- 1969US5384292ASilicon nitride composite sintered body and process for producing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1994·Granted Jan 24, 1995·21 cites·1 claims
- 2069US5165981ACeramic substrate and preparation of the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1991·Granted Nov 24, 1992·25 cites·4 claims
- 2169US5034357AHeat-conductive aluminum nitride sintered body and method of manufacturing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1989·Granted Jul 23, 1991·30 cites·23 claims
- 2268US5173458ASilicon nitride sintered body and process for producing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1991·Granted Dec 22, 1992·22 cites·6 claims
- 2368US5010388AConnection structure between components for semiconductor apparatusSUMITOMO ELECTRIC INDUSTRIES·Filed 1988·Granted Apr 23, 1991·36 cites·9 claims
- 2468US4965659AMember for a semiconductor structureSUMITOMO ELECTRIC INDUSTRIES·Filed 1988·Granted Oct 23, 1990·34 cites·9 claims
- 2568US4769350ASilicon nitride sintered material for cutting tools and process for making the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1987·Granted Sep 6, 1988·18 cites·8 claims
- 2666US4598053ACeramic compactsSUMITOMO ELECTRIC INDUSTRIES·Filed 1985·Granted Jul 1, 1986·18 cites·4 claims
- 2764US5564966AGrind-machining method of ceramic materialsSUMITOMO ELECTRIC INDUSTRIES·Filed 1994·Granted Oct 15, 1996·18 cites·4 claims
- 2864US5036026ASintered body of aluminum nitride and method for producing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1990·Granted Jul 30, 1991·17 cites·5 claims
- 2963US5424256ASilicon nitride sintered bodySUMITOMO ELECTRIC INDUSTRIES·Filed 1993·Granted Jun 13, 1995·17 cites·4 claims
- 3063US5343150AApparatus and method for measuring a physical property of a sample using an electron spin resonance spectrum of the sampleSUMITOMO ELECTRIC INDUSTRIES·Filed 1993·Granted Aug 30, 1994·22 cites·31 claims
- 3162US6410468B2Si3N4 ceramic, Si-base composition for production thereof and processes for producing theseSUMITOMO ELECTRIC INDUSTRIES·Filed 2001·Granted Jun 25, 2002·4 cites·9 claims
- 3261US6447923B1Metallized silicon nitride ceramic and fabricating process thereof as well as metallizing composite for the processSUMITOMO ELECTRIC INDUSTRIES·Filed 1998·Granted Sep 10, 2002·16 cites·12 claims
- 3361US5394015AMethod of producing sintered silicon nitridesSUMITOMO ELECTRIC INDUSTRIES·Filed 1993·Granted Feb 28, 1995·15 cites·6 claims
- 3460US6143677ASilicon nitride sinter having high thermal conductivity and process for preparing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1998·Granted Nov 7, 2000·16 cites·10 claims
- 3560US5622905ASilicon nitride based sintered bodySUMITOMO ELECTRIC INDUSTRIES·Filed 1994·Granted Apr 22, 1997·13 cites·2 claims
- 3660US4383957AMethod of sintering a ceramic compositionSUMITOMO ELECTRIC INDUSTRIES·Filed 1981·Granted May 17, 1983·15 cites·5 claims
- 3759US5085923AHeat-conductive aluminum nitride sintered body and method of manufacturing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1991·Granted Feb 4, 1992·24 cites·6 claims
- 3858US5780374AHigh-strength porous silicon nitride body and process for producing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1996·Granted Jul 14, 1998·15 cites·11 claims
- 3958US4906295ADispersed reinforced ceramicsSUMITOMO ELECTRIC INDUSTRIES·Filed 1988·Granted Mar 6, 1990·12 cites·2 claims
- 4057US4764490AProcess for preparation of sintered silicon nitrideSUMITOMO ELECTRIC INDUSTRIES·Filed 1986·Granted Aug 16, 1988·13 cites·39 claims
- 4156US5696042ACeramic porous body and method for preparing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1995·Granted Dec 9, 1997·14 cites·12 claims
- 4256US5370907AForming a metallized layer on an AlN substrate by applying and heating a paste of a metal composed of W and MoSUMITOMO ELECTRIC INDUSTRIES·Filed 1993·Granted Dec 6, 1994·13 cites·10 claims
- 4356US5275772ASilicon nitride sintered body and process for producing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1992·Granted Jan 4, 1994·11 cites·1 claims
- 4455US5533930AApparatus for producing a silicon nitride sintered bodySUMITOMO ELECTRIC INDUSTRIES·Filed 1994·Granted Jul 9, 1996·17 cites·9 claims
- 4555US4994418ACeramic compact and a process for the production of the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1989·Granted Feb 19, 1991·12 cites·4 claims
- 4654US5204297ASilicon nitride sintered body and process for producing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1992·Granted Apr 20, 1993·10 cites·5 claims
- 4753US6001759ASilicon nitride sintered body, method of preparing the same and nitrided compactSUMITOMO ELECTRIC INDUSTRIES·Filed 1998·Granted Dec 14, 1999·12 cites·19 claims
- 4853US5756411ASintered body of silicon nitride and method of producing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1995·Granted May 26, 1998·12 cites·19 claims
- 4953US5543371ASlide member and method of manufacturing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 1993·Granted Aug 6, 1996·9 cites·8 claims
- 5052US5395694AAluminum nitride powder having surface layer containing oxynitrideSUMITOMO ELECTRIC INDUSTRIES·Filed 1993·Granted Mar 7, 1995·10 cites·8 claims
Showing the top 50 of 102 patent records by PatentIndex Score.
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