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USPTO Patent Rankings Data through Dec 31, 2025
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Kei DOIOKA — 1 Patent

KCKoha Co.: 1 patents #34 of 58Top 60%
TATamura: 1 patents #94 of 193Top 50%
Tokyo, JP: #57,845 of 90,295 inventorsTop 65%
Overall (All Time): #2,406,284 of 4,157,543Top 60%
1 Patents All Time
Kei DOIOKA has been granted 1 US patent while listed as an inventor at Koha Co.. All of these patents were granted in 2020. Kei DOIOKA ranks #2,406,284 of 4,157,543 US inventors in our database (top 57.9%). Patent records list Kei DOIOKA in Tokyo, JP.

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
10526721 Method for growing β-GA2O3-based single crystal Shinya Watanabe, Kazuyuki Iizuka, Haruka Matsubara, Takekazu Masui 2020-01-07

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