Inventor · disambiguated record
Kei Hirai
Also filed as: HIRAI KEI
6 granted patents·4 pending applications·2 citations·filing 2010–2023
66Inventor score
Files withSUMITOMO ELECTRIC INDUSTRIES5KUROSAWA KENSETSU KK2SUMITOMO ELECTRIC HARDMETAL CORP2KUROSAWA RYOHEI1
Top patents by PatentIndex Score
10 records- 0170US12467119B2Diamond sintered material and tool including diamond sintered materialSUMITOMO ELECTRIC HARDMETAL CORP·Filed 2021·Granted Nov 11, 2025·0 cites·5 claims
- 0264US2025320589A1Steel wire and method of manufacturing steel wireSUMITOMO ELECTRIC INDUSTRIES·Filed 2023·Application pending·0 cites
- 0361US8191251B2Method for forming rustproof film on a PC strandKUROSAWA RYOHEI·Filed 2010·Granted Jun 5, 2012·2 cites·9 claims
- 0458US2025003034A1Cubic boron nitride sintered materialSUMITOMO ELECTRIC INDUSTRIES·Filed 2022·Application pending·0 cites
- 0556US12451407B2Composite material, semiconductor package, and method of manufacturing composite materialSUMITOMO ELECTRIC INDUSTRIES·Filed 2021·Granted Oct 21, 2025·0 cites·18 claims
- 0653US12428585B2Coated super-abrasive grains, abrasive grains, and wheelSUMITOMO ELECTRIC INDUSTRIES·Filed 2020·Granted Sep 30, 2025·0 cites·20 claims
- 0751US2024196582A1Differential signal transmission cableSUMITOMO ELECTRIC INDUSTRIES·Filed 2021·Application pending·0 cites
- 0850US2022041446A1Polycrystalline cubic boron nitride and method for manufacturing the sameSUMITOMO ELECTRIC HARDMETAL CORP·Filed 2019·Application pending·0 cites
- 0946US8882944B2Method for forming rustproof film on PC strand and PC strandKUROSAWA KENSETSU KK·Filed 2013·Granted Nov 11, 2014·0 cites·2 claims
- 1043US8833050B2Double rustproof PC strandKUROSAWA KENSETSU KK·Filed 2013·Granted Sep 16, 2014·0 cites·6 claims
Join the waitlist — get patent alerts
Get an alert when Kei 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 →