Inventor · disambiguated record
Toshio Hirai
Also filed as: HIRAI TOSHIO
42 granted patents·1 pending application·865 citations·filing 1977–2017
98Inventor score
Top patents by PatentIndex Score
43 records- 0195US4118539ASuper hard-highly pure silicon nitrides having a preferred crystal face orientationRES INST IRON STEEL·Filed 1977·Granted Oct 3, 1978·47 cites·4 claims
- 0294US4751099AMethod of producing a functionally gradient materialNAT AEROSPACE LAB·Filed 1986·Granted Jun 14, 1988·114 cites·5 claims
- 0394US4565747ABoron nitride containing titanium nitride, method of producing the same and composite ceramics produced therefromRESEARCH DEV CORP·Filed 1984·Granted Jan 21, 1986·92 cites·22 claims
- 0491US5045356AProcess for producing carbon/carbon composite having oxidation resistanceNIPPON OIL CO LTD·Filed 1989·Granted Sep 3, 1991·56 cites·4 claims
- 0588US5211031AScroll type compressor and refrigeration cycle using the sameHITACHI LTD·Filed 1991·Granted May 18, 1993·85 cites·9 claims
- 0686US4469801ATitanium-containing silicon nitride film bodies and a method of producing the sameHIRAI TOSHIO·Filed 1981·Granted Sep 4, 1984·52 cites·2 claims
- 0783US4746635AHigh strength and high hardness alumina-zirconia-silicon carbide sintered ceramic composite and its manufacturing processRIKEN KK·Filed 1986·Granted May 24, 1988·40 cites·11 claims
- 0878US10677235B2Compression device having connection unit for cooling unitKOBE STEEL LTD·Filed 2014·Granted Jun 9, 2020·2 cites·4 claims
- 0977US5384293ARare earth oxide-alumina-silica sintered body and method of producing the sameFiled 1992·Granted Jan 24, 1995·27 cites·13 claims
- 1074US6115180AOptical multilayered-film filterALPS ELECTRIC CO LTD·Filed 1999·Granted Sep 5, 2000·45 cites·11 claims
- 1174US5429998ACrystalline sialon having wurtzite structureALPS ELECTRIC CO LTD·Filed 1993·Granted Jul 4, 1995·24 cites·2 claims
- 1273US4312921ASuper hard-highly pure silicon nitridesRES INST IRON STEEL·Filed 1978·Granted Jan 26, 1982·13 cites·4 claims
- 1372US4340568ASuper hard highly pure silicon nitrides and a process and apparatus for producing the sameRES INST IRON STEEL·Filed 1980·Granted Jul 20, 1982·15 cites·1 claims
- 1471US6975987B1Device and method for synthesizing speechARCADIA INC·Filed 2000·Granted Dec 13, 2005·23 cites·12 claims
- 1570US4900526APolycrystalline rhombohedral boron nitride and method of producing the sameJAPAN RES DEV CORP·Filed 1986·Granted Feb 13, 1990·21 cites·10 claims
- 1668US9777726B2Compressor with valve pressing portions for sealingKOBE STEEL LTD·Filed 2014·Granted Oct 3, 2017·1 cites·12 claims
- 1767US4920014AZirconia film and process for preparing itSUMITOMO METAL MINING CO·Filed 1988·Granted Apr 24, 1990·19 cites·6 claims
- 1866US6891140B2Sintering furnace, method of manufacturing sintered objects, and sintered objectsJP NAT INST FOR FUSION SCIENCE·Filed 2001·Granted May 10, 2005·14 cites·11 claims
- 1966US6592798B1Method for preparing eutectic ceramicsOMORI MAMORU·Filed 2000·Granted Jul 15, 2003·8 cites·4 claims
- 2065US4393097AElectrically conductive Si3 N4 -C series amorphous material and a method of producing the sameHIRAI TOSHIO·Filed 1980·Granted Jul 12, 1983·17 cites·14 claims
- 2159US5093156AProcess for preparing carbon materialNIPPON OIL CO LTD·Filed 1990·Granted Mar 3, 1992·15 cites·6 claims
- 2259US5093150ASynthesis method by plasma chemical vapor depositionALPS ELECTRIC CO LTD·Filed 1990·Granted Mar 3, 1992·19 cites·4 claims
- 2358US9328970B2Compressing deviceKOBE STEEL LTD·Filed 2014·Granted May 3, 2016·0 cites·8 claims
- 2456US4772304ATransparent BN-type ceramic material and method of producing the sameJAPAN RES DEV CORP·Filed 1986·Granted Sep 20, 1988·18 cites·6 claims
- 2556US4585704AElectrically conductive Si3 N4 --C series amorphous material and a method of processing the sameHIRAI TOSHIO·Filed 1984·Granted Apr 29, 1986·12 cites·10 claims
- 2655US4985117AMethod of manufacturing josephson junctionsRIKEN KK·Filed 1990·Granted Jan 15, 1991·13 cites·13 claims
- 2754US9605671B2Reciprocating compressorKOBE STEEL LTD·Filed 2014·Granted Mar 28, 2017·0 cites·5 claims
- 2852US5439853AMixed oxide composite ceramics and method of producing the sameFiled 1992·Granted Aug 8, 1995·10 cites·26 claims
- 2952US2015059569A1Compression apparatusKOBE STEEL LTD·Filed 2014·Application pending·0 cites
- 3050US4940851AMembrane for use in X-ray mask and method for preparing the sameJAPAN RES DEV CORP·Filed 1987·Granted Jul 10, 1990·9 cites·8 claims
- 3148US6542876B1Method for producing multilayered optical filters using a genetic algorithm and a method for operating the genetic algorithmALPS ELECTRIC CO LTD·Filed 2000·Granted Apr 1, 2003·3 cites·23 claims
- 3246US10535130B2Life determination device, life determination method, and recording medium for cutting toolFANUC CORP·Filed 2017·Granted Jan 14, 2020·0 cites·8 claims
- 3345US5145720AChemical vapor deposition of dense and transparent zirconia filmsSUMITOMO METAL MINING CO·Filed 1990·Granted Sep 8, 1992·5 cites·6 claims
- 3443US5340959AEDM with an electrode moved by deformation of an electrode actuatorFANUC LTD·Filed 1993·Granted Aug 23, 1994·9 cites·7 claims
- 3539US5164221AForming die manufacturing methodALPS ELECTRIC CO LTD·Filed 1991·Granted Nov 17, 1992·7 cites·9 claims
- 3638US6149346AMethod for replacement of existing pipes and device for carrying out the methodTOHO GAS KK·Filed 1998·Granted Nov 21, 2000·14 cites·8 claims
- 3736US5187342AWire cut electric discharge machineFANUC LTD·Filed 1990·Granted Feb 16, 1993·5 cites·5 claims
- 3834US5586140APlasma melting method and plasma melting furnaceHITACHI SHIPBUILDING ENG CO·Filed 1995·Granted Dec 17, 1996·5 cites·39 claims
- 3933US4312924ASuper hard highly pure silicon nitridesRES INST IRON STEEL·Filed 1980·Granted Jan 26, 1982·1 cites·8 claims
- 4033US4279689AProcess for producing super hard-highly pure silicon nitridesRES INST IRON STEEL·Filed 1978·Granted Jul 21, 1981·1 cites·4 claims
- 4131US5173459ASi3 N4 -A12 O3 composite sintered bodies and method of producing the sameNIIHARA KOICHI·Filed 1990·Granted Dec 22, 1992·2 cites·5 claims
- 4230US4224296ASuper hard-highly pure silicon nitrides, and a process and apparatus for producing the sameRES INST IRON STEEL·Filed 1978·Granted Sep 23, 1980·0 cites·1 claims
- 4329US4312923ASuper hard-highly pure silicon nitrides, and a process and apparatus for producing the sameRES INST IRON STEEL·Filed 1980·Granted Jan 26, 1982·2 cites·4 claims
Join the waitlist — get patent alerts
Get an alert when Toshio Hirai files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →