Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Jun Niijima — 24 Patents

EIEisai: 12 patents #91 of 998Top 10%
ECEisai R&D Management Co.: 12 patents #22 of 817Top 3%
MEMercian: 4 patents #14 of 110Top 15%
ARAmerican Regent: 1 patents #130 of 274Top 50%
Ibaraki, JP: #308 of 6,779 inventorsTop 5%
Overall (All Time): #168,038 of 4,157,543Top 5%
24 Patents All Time
Jun Niijima has been granted 24 US patents while listed as an inventor at Eisai. The first was granted in 1993 and the most recent in July 2023. Jun Niijima ranks #168,038 of 4,157,543 US inventors in our database (top 4.0%). Patent records list Jun Niijima in Ibaraki, JP.

Patents per Year

Patents granted per year, 1993 to 2023Bar chart with a peak of 3 patents in 1998.peak 31993: 1 patents19931994: 2 patents1995: 1 patents19951997: 2 patents1998: 3 patents19981999: 1 patents2006: 1 patents20062007: 1 patents2009: 2 patents20092010: 3 patents2011: 3 patents20112013: 3 patents2023: 1 patents2023

Issued Patents All Time

Showing 1–24 of 24 patents

Patent #TitleCo-InventorsDate
11691990 Salts of compounds and crystals thereof Hirofumi Kuroda, So Yasui, Yoko Ito, Ikuo Kushida 2023-07-04
8530654 Crystals, amorphous substances or salts of methyl N-[3-(6,7-dimethoxy-2-methylaminoquinazolin-4-yl) phenyl] terephthalamic acid Eiichi Yamamoto, Osamu Asano, Kazumasa Nara 2013-09-10
8492543 Method for producing quinazoline derivative 2013-07-23
8410277 Method for manufacturing heterocycle substituted pyridine derivatives Kazuhiro Yoshizawa, Yuki KOSAKA, Shinya Abe 2013-04-02
8058444 Heterocycle-substituted pyridine derivative's salt or crystal thereof Kazutaka Nakamoto, Masayuki Matsukura, Keigo Tanaka, Eiichi Yamamoto, Takuma Minamisono 2011-11-15
7893068 Physiologically active substances Yoshihiko Kotake, Yoshio Fukuda, Mitsuo Nagai, Regina Mikie Kanada, Takashi Nakashima +2 more 2011-02-22
7884128 Process for total synthesis of pladienolide B and pladienolide D Regina Mikie Kanada, Daisuke Ito, Takashi Sakai, Naoki Asai, Yoshihiko Kotake 2011-02-08
7816401 Process for total synthesis of pladienolide B and pladienolide D Regina Mikie Kanada, Daisuke Ito, Takashi Sakai, Naoki Asai, Yoshihiko Kotake 2010-10-19
7803949 Process for preparation of water-soluble azole prodrugs Manabu Sasho, Keizo Sato, Mamoru Miyazawa, Shigeto Negi, Atsushi Kamada 2010-09-28
7667052 Bioactive substance Yoshiharu Mizui, Takashi Sakai, Satoshi Yamamoto, Keisuke Komeda, Masanori Fujita +19 more 2010-02-23
7619100 Physiologically active substances Yoshihiko Kotake, Yoshio Fukuda, Mitsuo Nagai, Regina Mikie Kanada, Takashi Nakashima +2 more 2009-11-17
7550503 Physiologically active substances Yoshihiko Kotake, Yoshio Fukuda, Mitsuo Nagai, Regina Mikie Kanada, Takashi Nakashima +2 more 2009-06-23
7256178 Physiologically active substances Yoshihiko Kotake, Yoshio Fukuda, Mitsuo Nagai, Regina Mikie Kanada, Susumu Takeda +4 more 2007-08-14
7026352 Physiologically active substances Yoshiharu Mizui, Takashi Sakai, Satoshi Yamamoto, Keisuke Komeda, Masanori Fujita +19 more 2006-04-11
5952335 Fused polycyclic heterocycle derivatives Hiroyuki Sugumi, Yoshihiko Kotake, Toshimi Okada, Jun-ichi Kamata, Kentaro Yoshimatsu +7 more 1999-09-14
5854274 Tricyclic heterocyclic sulfonamide and sulfonic ester derivatives Hiroshi Yoshino, Norihiro Ueda, Toru Haneda, Yoshihiko Kotake, Kentaro Yoshimatsu +5 more 1998-12-29
5846969 Tricyclic heterocyclic sulfonamide and sulfonic ester derivatives Hiroshi Yoshino, Norihiro Ueda, Toru Haneda, Yoshihiko Kotake, Kentaro Yoshimatsu +5 more 1998-12-08
5834462 Tricyclic heterocyclic sulfonamide and sulfonic ester derivatives Hiroshi Yoshino, Norihiro Ueda, Toru Haneda, Yoshihiko Kotake, Kentaro Yoshimatsu +5 more 1998-11-10
5610304 Pyrimidinyl or pyridinyl sulfonamide substituted compounds Hiroshi Yoshino, Norihiro Ueda, Hiroyuki Sugumi, Yoshihiko Kotake, Toshimi Okada +8 more 1997-03-11
5610320 Sulfonamide phenyl substituted compounds Hiroshi Yoshino, Norihiro Ueda, Hirovuki Sugumi, Yoshihiko Kotake, Toshimi Okada +8 more 1997-03-11
5434172 Sulfonamide derivatives Hiroshi Yoshino, Norihiro Ueda, Hiroyuki Sugumi, Yoshihiko Kotake, Toshimi Okada +8 more 1995-07-18
5332751 Pyridine carboxamide compounds which have useful as pharmaceutical utility Hiroshi Yoshino, Norihiro Ueda, Hiroyuki Sugumi, Yoshihiko Kotake, Toshimi Okada +8 more 1994-07-26
5292758 Sulfonamide derivatives Hiroshi Yoshino, Norihiro Ueda, Hiroyuki Sugumi, Yoshihiko Kotake, Toshimi Okada +8 more 1994-03-08
5250549 Sulfonamide derivatives Hiroshi Yoshino, Norihiro Ueda, Hiroyuki Sugumi, Yoshihiko Kotake, Toshimi Okada +8 more 1993-10-05