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USPTO Patent Rankings Data through Dec 31, 2025
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Kyosuke Kitoh — 25 Patents

EIEisai: 25 patents #20 of 998Top 3%
Kawagoe, JP: #54 of 1,278 inventorsTop 5%
Overall (All Time): #158,593 of 4,157,543Top 4%
25 Patents All Time
Kyosuke Kitoh has been granted 25 US patents while listed as an inventor at Eisai. The first was granted in 1981 and the most recent in December 1998. Kyosuke Kitoh ranks #158,593 of 4,157,543 US inventors in our database (top 3.8%). Patent records list Kyosuke Kitoh in Kawagoe, JP.

Patents per Year

Patents granted per year, 1981 to 1998Bar chart with a peak of 3 patents in 1981.peak 31981: 3 patents19811982: 1 patents1983: 1 patents19831984: 1 patents1985: 2 patents19851989: 1 patents1990: 2 patents19901991: 2 patents1992: 1 patents19921993: 1 patents1994: 2 patents19941995: 1 patents1996: 1 patents19961997: 3 patents1998: 3 patents1998

Issued Patents All Time

Showing 1–25 of 25 patents

Patent #TitleCo-InventorsDate
5854274 Tricyclic heterocyclic sulfonamide and sulfonic ester derivatives Hiroshi Yoshino, Norihiro Ueda, Jun Niijima, Toru Haneda, Yoshihiko Kotake +5 more 1998-12-29
5846969 Tricyclic heterocyclic sulfonamide and sulfonic ester derivatives Hiroshi Yoshino, Norihiro Ueda, Jun Niijima, Toru Haneda, Yoshihiko Kotake +5 more 1998-12-08
5834462 Tricyclic heterocyclic sulfonamide and sulfonic ester derivatives Hiroshi Yoshino, Norihiro Ueda, Jun Niijima, Toru Haneda, Yoshihiko Kotake +5 more 1998-11-10
5688800 Condensed pyrimidine derivative Hiroaki Nomura, Toru Haneda, Yoshihiko Kotake, Norihiro Ueda 1997-11-18
5610304 Pyrimidinyl or pyridinyl sulfonamide substituted compounds Hiroshi Yoshino, Norihiro Ueda, Hiroyuki Sugumi, Jun Niijima, Yoshihiko Kotake +8 more 1997-03-11
5610320 Sulfonamide phenyl substituted compounds Hiroshi Yoshino, Norihiro Ueda, Hirovuki Sugumi, Jun Niijima, Yoshihiko Kotake +8 more 1997-03-11
5554615 Condensed pyrimidine derivative Hiroaki Nomura, Toru Haneda, Yoshihiko Kotake, Norihiro Ueda 1996-09-10
5434172 Sulfonamide derivatives Hiroshi Yoshino, Norihiro Ueda, Hiroyuki Sugumi, Jun Niijima, Yoshihiko Kotake +8 more 1995-07-18
5332751 Pyridine carboxamide compounds which have useful as pharmaceutical utility Hiroshi Yoshino, Norihiro Ueda, Hiroyuki Sugumi, Jun Niijima, Yoshihiko Kotake +8 more 1994-07-26
5292758 Sulfonamide derivatives Hiroshi Yoshino, Norihiro Ueda, Hiroyuki Sugumi, Jun Niijima, Yoshihiko Kotake +8 more 1994-03-08
5250549 Sulfonamide derivatives Hiroshi Yoshino, Norihiro Ueda, Hiroyuki Sugumi, Jun Niijima, Yoshihiko Kotake +8 more 1993-10-05
5089491 3-propenylcephem derivative Takashi Kamiya, Toshihiko Naito, Shigeto Negi, Yuuki Komatu, Yasunobu Kai +6 more 1992-02-18
5075296 Azacyclooctadiene compound and pharmaceutical use Kenji Koga, Kiyoshi Tomioka, Yoshihiro Kubota, Makoto Asada 1991-12-24
5006649 3-propenylcephem derivative Takashi Kamiya, Toshihiko Naito, Shigeto Negi, Yuuki Komatu, Yasunobu Kai +6 more 1991-04-09
4929612 Thiadiazolylacetamide cephem derivatives Yoshimasa Machida, Shigeto Negi, Takashi Kamiya, Yuuki Komatu, Isao Sugiyama +5 more 1990-05-29
4921850 3-propenylcephem derivative Takashi Kamiya, Toshihiko Naito, Shigeto Negi, Yuuki Komatu, Yasunobu Kai +6 more 1990-05-01
4839389 Polyprenyl alcohol-containing injections Noritoshi Koyama, Takayuki Ikeuchi, Seiichi Araki, Katsumi Ida 1989-06-13
4546176 7-Carboxymethoxyphenylacetamido-3-cephem derivatives and antibacterial preparations containing the same Yoshimasa Machida, Shigeto Negi, Seiichiro Nomoto, Takashi Kamiya, Isao Saito 1985-10-08
4513145 2-Methylchromone derivatives and process for their preparation Shigeto Negi, Seiichiro Nomoto, Takashi Kamiya, Yoshimasa Machida, Isao Saito 1985-04-23
4468394 Cephalosporin compounds Yoshimasa Machida, Isao Saito, Isao Sugiyama, Shigeto Negi, Seiichiro Nomoto +2 more 1984-08-28
4415567 7.alpha.-Methoxycephalosporin derivatives, and antibacterial drugs containing the same Yoshimasa Machida, Isao Saito, Seiichiro Nomoto, Shigeto Negi, Hironori Ikuta 1983-11-15
4344944 7-.alpha.-methoxycephalosporin derivatives, and antibacterial drugs onctaining the same Yoshimasa Machida, Isao Saito, Seiichiro Nomoto, Shigeto Negi, Hironori Ikuta 1982-08-17
4285939 Cephalosporin derivatives, and antibacterial drugs containing the derivatives Yoshimasa Machida, Isao Saito, Motosuke Yamanaka, Seiichiro Nomoto, Shigeto Negi +4 more 1981-08-25
4285940 Cephalosporin derivatives, and antibacterial drugs comprising said derivatives Yoshimasa Machida, Isao Saito, Seiichiro Nomoto, Shigeto Negi, Hironori Ikuta 1981-08-25
4285941 Cephalosporin compounds and antibacterial drugs containing the same Yoshimasa Machida, Isao Saito, Seiichiro Nomoto, Shigeto Negi, Takeo Kanai +3 more 1981-08-25