Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Yoshikage Nakajima — 5 Patents

EIEisai: 5 patents #240 of 998Top 25%
Tokyo, JP: #26,440 of 90,295 inventorsTop 30%
Overall (All Time): #907,971 of 4,157,543Top 25%
5 Patents All Time
Yoshikage Nakajima has been granted 5 US patents while listed as an inventor at Eisai. The first was granted in 1980 and the most recent in March 1991. Yoshikage Nakajima ranks #907,971 of 4,157,543 US inventors in our database (top 21.8%). Patent records list Yoshikage Nakajima in Tokyo, JP.

Patents per Year

Patents granted per year, 1980 to 1991Bar chart with a peak of 2 patents in 1982.peak 21980: 1 patents19801982: 2 patents19821983: 1 patents19831991: 1 patents1991

Issued Patents All Time

Showing 1–5 of 5 patents

Patent #TitleCo-InventorsDate
5002958 Hypotensive agent Mamoru Tanaka, Tetsuya Tajima 1991-03-26
4421763 Cyclohexane derivatives, process for preparation thereof and medicines containing these cyclohexane derivatives Sachiyuki Hamano, Shinichi Kitamura, Toshiji Igarashi 1983-12-20
4350705 Cyclohexane derivatives, process for preparation thereof and medicines containing these cyclohexane derivatives Sachiyuki Hamano, Shinichi Kitamura, Toshiji Igarashi 1982-09-21
4325974 .beta., .gamma.-Dihydropolyprenyl alcohol and hypotensive pharmaceutical composition containing same Isao Yamatsu, Shinya Abe, Yuichi Inai, Toshiji Igarashi 1982-04-20
4199587 Method of treating hypertension with polyprenyl alcohol ester Shizumasa Kijima, Isao Yamatsu, Yuichi Inai, Toshiji Igarashi 1980-04-22