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

Hiroyuki Maruyama — 73 Patents

KOKonica: 16 patents #102 of 1,958Top 6%
SESeiko Epson: 10 patents #1,850 of 7,774Top 25%
Canon: 6 patents #8,497 of 19,416Top 45%
Hitachi: 6 patents #6,582 of 28,497Top 25%
RTRenesas Technology: 6 patents #492 of 3,337Top 15%
Fujitsu Limited: 5 patents #6,029 of 24,456Top 25%
HZHitachi Zosen: 5 patents #33 of 531Top 7%
HCHitachi Ulsi Systems Co.: 5 patents #151 of 867Top 20%
KMKonica Minolta: 4 patents #503 of 1,361Top 40%
Sony: 3 patents #10,744 of 25,231Top 45%
KCKonishiroku Photo Industry Co.: 3 patents #262 of 894Top 30%
PLPfu Limited: 3 patents #122 of 478Top 30%
KMKonica Minolta: 2 patents #1,382 of 2,718Top 55%
KAKaneka: 2 patents #598 of 1,525Top 40%
RERenesas Electronics: 1 patents #2,739 of 4,529Top 65%
The Procter & Gamble: 1 patents #6,322 of 10,133Top 65%
Panasonic: 1 patents #13,264 of 21,108Top 65%
Overall (All Time): #27,122 of 4,157,543Top 1%
73 Patents All Time

Issued Patents All Time

Showing 51–73 of 73 patents

Patent #TitleCo-InventorsDate
6450625 Electrostatic actuator, manufacturing method therefor, and liquid discharging device using the same Masahiro Fujii, Kazuhiko Sato, Koji Kitahara, Tomohiro Makigaki, Shigeo Nojima +1 more 2002-09-17
6410107 Methods for manufacturing an electrostatic actuator Kazuhiko Sato, Masahiro Fujii, Tadaaki Hagata, Koji Kitahara, Keiichi Mukaiyama 2002-06-25
6315907 Method for removing toxic shock syndrome toxin-1 in body fluids by adsorption Fumiyasu Hirai, Eiji Ogino, Takayuki Sakogawa, Takashi Asahi, Nobutaka Tani 2001-11-13
6213590 Inkjet head for reducing pressure interference between ink supply passages Masahiro Fujii, Keiichi Mukaiyama, Tadaaki Hagata, Ikuhiro Miyashita 2001-04-10
6190003 Electrostatic actuator and manufacturing method therefor Kazuhiko Sato, Masahiro Fujii, Tadaaki Hagata, Koji Kitahara, Keiichi Mukaiyama 2001-02-20
6164759 Method for producing an electrostatic actuator and an inkjet head using it Masahiro Fujii, Keiichi Mukaiyama, Tadaaki Hagata, Yoshio Maeda, Hiroshi Komatsu +1 more 2000-12-26
6089563 Paper supply apparatus for image reading apparatus and image reading apparatus with paper supply apparatus as well as paper supply apparatus Yoshihiro Takashimizu, Toshiaki Anzai, Seigo Umeda, Tadayoshi Nakata, Toshiaki KUMAGAI +1 more 2000-07-18
5992978 Ink jet recording apparatus, and an ink jet head manufacturing method Masahiro Fujii, Keiichi Mukaiyama, Tadaaki Hagata, Ikuhiro Miyashita 1999-11-30
5956161 Image reading apparatus having a steeply inclined paper transport path Yoshihiro Takashimizu, Masahiro Yoshida, Toshiaki Anzai, Hirotoshi Kakegawa, Noriaki Yamazaki +4 more 1999-09-21
5912684 Inkjet recording apparatus Masahiro Fujii, Keiichi Mukaiyama, Tadaaki Hagata, Mitsuro Atobe, Shinichi Kamisuki +4 more 1999-06-15
5823522 Sheet holder removably attached to data processing apparatus Tatsuo Fujiwara, Toshio Saitoh 1998-10-20
5818473 Drive method for an electrostatic ink jet head for eliminating residual charge in the diaphragm Masahiro Fujii, Hiroyuki Ishikawa, Shigeo Nojima, Atsushi Yamaji 1998-10-06
5715071 Paper supply apparatus for image reading apparatus and image reading apparatus with paper supply apparatus as well as paper supply apparatus Yoshihiro Takashimizu, Toshiaki Anzai, Seigo Umeda, Tadayoshi Nakata, Toshiaki KUMAGAI +1 more 1998-02-03
5644341 Ink jet head drive apparatus and drive method, and a printer using these Masahiro Fujii, Ikuhiro Miyashita, Hiroshi Koeda, Keiichi Mukaiyama, Noriyoshi Otsuki +2 more 1997-07-01
5438437 Image forming apparatus with exposure, size, and position correction for pixels Yoshimi Mizoguchi, Hiroshi Ishii, Kiyoshi Kimura, Masakazu Fukuchi, Makoto Takeda +4 more 1995-08-01
5231513 Image forming apparatus Jun Yokobori, Takashi Murahashi, Masashi Sugano 1993-07-27
5070367 Color image forming apparatus with an automatic color selection mode Masahi Sugano, Takashi Murahashi, Jun Yokobori 1991-12-03
5070374 Color image forming apparatus Takashi Murahashi, Masashi Sugano, Jun Yokobori 1991-12-03
5061966 Method of cleaning an image retainer Satoshi Haneda, Hisashi Shoji, Seiichiro Hiratsuka, Tadao Kishimoto, Toshifumi Isobe +1 more 1991-10-29
5023708 Color image forming apparatus for superposing a plurality of images Tadao Kishimoto, Toshifumi Isobe, Jun Yokobori 1991-06-11
4878110 Color image processing apparatus which accurately registers multiple color images by counting pulses from a timer reset by a drum index signal Tadao Kishimoto, Toshifumi Isobe, Jun Yokobori 1989-10-31
4849829 Image recording apparatus Tadao Kishimoto, Toshifumi Isobe, Jun Yokobori 1989-07-18
4806973 Color image-forming apparatus for producing overlapped monochrome images Tadao Kishimoto, Toshifumi Isobe, Jun Yokobori 1989-02-21