Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Yoshimasa Machida — 42 Patents

EIEisai: 42 patents #4 of 998Top 1%
Wako, JP: #68 of 4,014 inventorsTop 2%
Overall (All Time): #72,062 of 4,157,543Top 2%
42 Patents All Time
Yoshimasa Machida has been granted 42 US patents while listed as an inventor at Eisai. The first was granted in 1981 and the most recent in August 2001. Yoshimasa Machida ranks #72,062 of 4,157,543 US inventors in our database (top 1.7%). Patent records list Yoshimasa Machida in Wako, JP.

Patents per Year

Patents granted per year, 1981 to 2001Bar chart with a peak of 6 patents in 1995.peak 61981: 3 patents19811982: 4 patents1983: 1 patents19831984: 2 patents1985: 2 patents19851987: 1 patents1988: 1 patents19881990: 2 patents1991: 4 patents19911992: 2 patents1993: 2 patents19931994: 3 patents1995: 6 patents19951996: 5 patents1997: 1 patents19971998: 2 patents2001: 1 patents2001

Issued Patents All Time

Showing 1–25 of 42 patents

Patent #TitleCo-InventorsDate
6281214 Biphenyl derivatives Kozo Akasaka, Masahiro Yonaga, Akiharu Kajiwara, Kunizo Higurashi, Kohshi Ueno +10 more 2001-08-28
5849912 Biphenyl derivatives Kozo Akasaka, Masahiro Yonaga, Akiharu Kajiwara, Kunizo Higurashi, Kohshi Ueno +10 more 1998-12-15
5741902 7-acyl-3-(substituted carbamoyloxy) cephem compounds and process for their preparation Shigeto Negi, Motosuke Yamanaka, Kanemasa Katsu, Isao Sugiyama, Yuuki Komatu +2 more 1998-04-21
5604217 7-acyl-3-(substituted carbamoyloxy) cephem compounds and process for their preparation Shigeto Negi, Motosuke Yamanaka, Kanemasa Katsu, Isao Sugiyama, Yuuki Komatu +2 more 1997-02-18
5587473 7-acyl-3-(substituted carbamoyloxy) cephem compounds and process for their preparation Shigeto Negi, Motosuke Yamanaka, Kanemasa Katsu, Isao Sugiyama, Yuuki Komatu +2 more 1996-12-24
5563265 7-acyl-3-(substituted carbamoyloxy) cephem compounds Shigeto Negi, Motosuke Yamanaka, Kanemasa Katsu, Isao Sugiyama, Yuuki Komatu +2 more 1996-10-08
5559225 7-acyl-3-(substituted carbamoyloxy) cephem compound Shigeto Negi, Motosuke Yamanaka, Kanemasa Katsu, Isao Sugiyama, Yuuki Komatu +2 more 1996-09-24
5527948 Naphthalene derivative Makoto Okita, Hiroshi Shirota, Masayuki Tanaka, Toshihiko Kaneko, Katsuya Tagami +13 more 1996-06-18
5482937 1,4-diazepine derivative and its pharmaceutical use Kazuo Okano, Shuhei Miyazawa, Richard Clark, Shinya Abe, Tetsuya Kawahara +14 more 1996-01-09
5476863 Glycerin derivative and its pharmacological use Kazuo Okano, Osamu Asano, Naoyuki Shimomura, Tetsuya Kawahara, Shinya Abe +11 more 1995-12-19
5476864 Glycerin derivative and its pharmacological use Kazuo Okano, Osamu Asano, Naoyuki Shimomura, Tetsuya Kawahara, Shinya Abe +11 more 1995-12-19
5468740 1,4-diazepine derivative and its pharmaceutical use Kazuo Okano, Shuhei Miyazawa, Richard Clark, Shinya Abe, Tetsuya Kawahara +14 more 1995-11-21
5438045 1,4-diazepine derivative and its pharmaceutical use Kazuo Okano, Shuhei Miyazawa, Richard Clark, Shinya Abe, Tetsuya Kawahara +14 more 1995-08-01
5409909 1,4-diazepine derivative and its pharmaceutical use Kazuo Okano, Shuhei Miyazawa, Richard Clark, Shinya Abe, Tetsuya Kawahara +14 more 1995-04-25
5382579 Triazolo-1,4-diazepine derivatives and their use in pharmaceuticals Kazuo Okano, Shuhei Miyazawa, Richard Clark, Shinya Abe, Tetsuya Kawahara +14 more 1995-01-17
5373000 7Beta-(thiadiazolyl)-2-iminoacetamido-3cephem compounds Takashi Kamiya, Shigeto Negi, Toshihiko Naito, Yuuki Komatu, Seiichiro Nomoto +2 more 1994-12-13
5304553 1,4-diazepine derivative and its pharmaceutical use Kazuo Okano, Shuhei Miyazawa, Richar S. J. Clark, Shinya Abe, Tetsuya Kawahara +14 more 1994-04-19
5298649 Naphthalene derivative Makoto Okita, Hiroshi Shirota, Masayuki Tanaka, Toshihiko Kaneko, Katsuya Tagami +13 more 1994-03-29
5273985 Glycerin derivative and its pharmacological use Kazuo Okano, Osamu Asano, Naoyuki Shimomura, Tetsuya Kawahara, Shinya Abe +11 more 1993-12-28
5221671 Triazolo-1,4-diazepine derivatives and their use in pharmaceuticals Kazuo Okano, Shuhei Miyazawa, Richard Clark, Shinya Abe, Tetsuya Kawahara +14 more 1993-06-22
5134111 Naphthalene derivative Makoto Okita, Hiroshi Shirota, Masayuki Tanaka, Toshihiko Kaneko, Katsuya Tagami +13 more 1992-07-28
5089491 3-propenylcephem derivative Takashi Kamiya, Toshihiko Naito, Shigeto Negi, Yuuki Komatu, Yasunobu Kai +6 more 1992-02-18
5037827 Glycerin derivative and its pharmacological use Kazuo Okano, Osamu Asano, Naoyuki Shimomura, Tetsuya Kawahara, Shinya Abe +11 more 1991-08-06
5010188 Cephem derivatives Hiroshi Yamauchi, Isao Sugiyama, Isao Saito, Seiichiro Nomoto, Takashi Kamiya +1 more 1991-04-23
5008260 Cephem derivatives Hiroshi Yamauchi, Isao Sugiyama, Isao Saito, Seiichiro Nomoto, Takashi Kamiya +1 more 1991-04-16