Patent Leaderboard
USPTO Patent Rankings Data through Sept 30, 2025
EK

Eiichi Kato

Fujitsu Limited: 199 patents #1 of 24,456Top 1%
Kawasaki: 5 patents #446 of 2,943Top 20%
FUFujifilm: 4 patents #1,747 of 4,519Top 40%
TCThe Kinki Sharyo Co.: 3 patents #2 of 22Top 10%
Canon: 2 patents #12,681 of 19,416Top 70%
KKKabushiki Kaisha Vitamin Kenkyusya: 1 patents #9 of 19Top 50%
MIMitsui Petrochemical Industries: 1 patents #503 of 1,024Top 50%
NCNippon Paper Industries Co.: 1 patents #263 of 535Top 50%
JCJujo Paper Co.: 1 patents #46 of 105Top 45%
FCFuji Photo Co.: 1 patents #1 of 51Top 2%
Soma, JP: #1 of 570 inventorsTop 1%
Overall (All Time): #2,787 of 4,157,543Top 1%
217 Patents All Time

Issued Patents All Time

Showing 126–150 of 217 patents

Patent #TitleCo-InventorsDate
5229236 Electrophotographic lithographic printing plate precursor Kazuo Ishii, Seishi Kasai, Hirohisa Yamasaki 1993-07-20
5229241 Electrophotographic light-sensitive material Seishi Kasai, Kazuo Ishii 1993-07-20
5229240 Electrophotographic light-sensitive material Seishi Kasai, Kazuo Ishii 1993-07-20
5227272 Electrophotographic light-sensitive material 1993-07-13
5219705 Lithographic printing plate precursor of direct image type Kazuo Ishii 1993-06-15
5206104 Electrophotographic light-sensitive material 1993-04-27
5206105 Electrophotographic light-sensitive material 1993-04-27
5202208 Electrophotographic light-sensitive material 1993-04-13
5198319 Electrophotographic light-sensitive material 1993-03-30
5188917 Electrophotographic light-sensitive material 1993-02-23
5183720 Electrophotographic light-sensitive material Kazuo Ishii 1993-02-02
5183721 Electrophotographic light-sensitive material Kazuo Ishii 1993-02-02
5178983 Electrophotographic light-sensitive material Kazuo Ishii 1993-01-12
5178982 Electrophotographic light-sensitive material Kazuo Ishii 1993-01-12
5176975 Electrophotographic lithographic printing plate precursor Kazuo Ishii 1993-01-05
5154997 Electrophotographic light-sensitive material Seishi Kasai, Kazuo Ishii 1992-10-13
5147752 Process for producing electrophotographic light-sensitive material Kazuo Ishii 1992-09-15
5141835 Liquid developer for electrostatic photography Hideyuki Hattori 1992-08-25
5135831 Electrophotographic light-sensitive material 1992-08-04
5135830 Electrophotographic light-sensitive material 1992-08-04
5134051 Electrophotographic photoreceptor Kazuo Ishii 1992-07-28
5124221 Electrophotographic inorganic light-sensitive material with particular binder 1992-06-23
5116710 Electrophotographic light-sensitive material 1992-05-26
5114822 Liquid developer for electrostatic photography Hideyuki Hattori 1992-05-19
5112712 Electrophotographic photosensitive materials comprising an inorganic photoconductor and N-hydroxyimide compounds Seishi Kasai, Kazuo Ishii 1992-05-12