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Eisai Chemical Co., Ltd.

USPTO Granted Patents = 21

Forward Citations = 50

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27 inventors (with patents filed for the assignee):

Kimio Hamamura (8 out of 18 patents)

Yoshio Urawa (8 out of 12 patents)

Chiaki Seki (7 out of 10 patents)

4. Masayuki Konishi (7 out of 7 patents)

5. Yoji Yamagishi (6 out of 9 patents)

6. Ken Furukawa (6 out of 11 patents)

7. Tomio Tsurugi (5 out of 12 patents)

8. Toshikazu Shimizu (5 out of 12 patents)

9. Tomio Ichino (5 out of 8 patents)

10. Masahiko Tsujii (4 out of 11 patents)

11. Takeo Kanai (4 out of 4 patents)

12. Akihiko Shimotani (3 out of 4 patents)

13. Tetsuo Iwama (3 out of 3 patents)

14. Homare Shinohara (2 out of 2 patents)

15. Hirofumi Kuroda (2 out of 2 patents)

21 patents: Sort by Forward Citations

1. 5998611 - Process for producing cephem compounds in an aqueous medium (1999-12-07),

2. 5874611 - Butenyl hydroquinone derivatives (1999-02-23),

3. 5700938 - Intermediates for imidazopyridine derivatives (1997-12-23),

4. 5686635 - Tetrahydro-alkenyl-methanonaphthalene-5,8-dione derivatives (1997-11-11),

5. 5677471 - Process for the preparation of quinone derivative (1997-10-14),

6. 5665888 - Protected aminothiazolylacetic acid derivatives (1997-09-09),

7. 5650518 - Protected aminothiazolylacetic acid derivatives (1997-07-22),

8. 5637716 - Processes for the preparation of hydroquinone and benzoquinone (1997-06-10),

9. 5631378 - Protected aminothiazolylacetic acid derivatives (1997-05-20),

10. 5608092 - 1,4,4.sub.a 5,8,9.sub.a (1997-03-04),

11. 5608068 - Process for the preparation of imidazopyridine derivatives and (1997-03-04),

12. 5587504 - Sulfonyloxy-biphenylcarboxylic ester derivatives which are intermediates (1996-12-24),

13. 5565586 - Oxidative process for the preparation of allyl quinone derivatives (1996-10-15),

14. 5559236 - Intermediates for substituted biphenylmethylmidazopyridine angiotensin (1996-09-24),

15. 5557002 - Process for the preparation of biphenyl containing intermediates useful (1996-09-17),

Eisai Chemical Co., Ltd. is a pharmaceutical company based in Japan. They are dedicated to the discovery, development, and manufacture of innovative pharmaceutical products to improve the quality of life of patients worldwide. With a focus on neurological and oncology medications, Eisai Chemical Co., Ltd. strives to make a positive impact on the healthcare industry through their cutting-edge research and development efforts.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

21 Patents

#14 in Ibaraki

#2,798 in Japan

#29,031 in the World

Eisai Chemical Co., Ltd.

Forward Citations = 50

27 inventors:

Kimio Hamamura (8 out of 18 patents)

Yoshio Urawa (8 out of 12 patents)

Chiaki Seki (7 out of 10 patents)

4. Masayuki Konishi (7 out of 7 patents)

5. Yoji Yamagishi (6 out of 9 patents)

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