SI

Seiji Ishida

HC Hitachi Construction Machinery Co.: 20 patents #45 of 1,234Top 4%
HI Hitachi: 16 patents #2,438 of 28,497Top 9%
KS Kobe Steel: 3 patents #309 of 2,031Top 20%
HC Hitachi Industrial Equipment Systems Co.: 3 patents #164 of 550Top 30%
MM Mitsubishi Motors: 2 patents #508 of 1,823Top 30%
HS Hitachi Automotive Systems: 1 patents #965 of 1,636Top 60%
SC Sanyo Electric Co.: 1 patents #3,644 of 6,347Top 60%
SC Snow Brand Milk Products Co.: 1 patents #171 of 337Top 55%
AT Agency Of Industrial Science And Technology: 1 patents #568 of 1,778Top 35%
TK Toyo Boseki Kabushiki Kaisha: 1 patents #541 of 1,085Top 50%
📍 Tsuchiura, JP: #8 of 519 inventorsTop 2%
Overall (All Time): #66,147 of 4,157,543Top 2%
44
Patents All Time

Issued Patents All Time

Showing 26–44 of 44 patents

Patent #TitleCo-InventorsDate
6657412 Pulse width modulation method, pulse width modulator and power converter Keijiro Sakai, Toshiaki Okuyama, Hiroshi Fujii, Hiroyuki Tomita, Tatsuo Ando +2 more 2003-12-02
6642689 Control apparatus for power converter Toshiaki Okuyama, Takashi Ogawa, Tetsuo Kojima, Kiyoshi Nakata 2003-11-04
6611124 Control apparatus of induction motor 2003-08-26
6556460 Method for controlling a vehicle provided with an electric power converter Toshiaki Okuyama, Tetsuo Kojima, Kiyoshi Nakata, Akira Horie 2003-04-29
6556464 PWM converter system Keijirou Sakai, Toshiaki Okuyama, Kinya Nakatsu, Hiroshi Fujii, Junji Kato +1 more 2003-04-29
6496397 Inverter device Keijiro Sakai, Toshiaki Okuyama, Kinya Nakatsu, Hiroshi Fujii, Junji Kato +1 more 2002-12-17
6262294 Process for continuously producing monomer components from aromatic polyester Takeshi Sako, Masazumi Godo, Kunio Miura, Masayuki Tsugumi 2001-07-17
6214461 Modified hydrophobic textile product Yuichiro OMOTE, Seiichi Ochi, Hisao Nishinaka, Shinichiro Inatomi 2001-04-10
6173762 Heat exchanger tube for falling film evaporator Tomio HIGO, Tetsuo Uchida, Masahiro Furukawa, Masashi Izumi, Kazuhiro Yoshii 2001-01-16
6147470 Device for controlling induction motor and method of controlling the same Hironori Ohashi, Makoto Takase, Hiroyuki Tomita 2000-11-14
6058036 Inverter apparatus having operation specifications determined by type of I/O block which is connected to basic control unit Tsunehiro Endo, Kenji Nandoh, Tadao Shimotsu, Hiroyuki Benya 2000-05-02
5631819 Power converter Ryoso Masaki, Takashi Ikimi, Hironori Ohashi, Yuusuke Takamoto, Sanshiro Obara 1997-05-20
5590711 Heat transfer tube for absorber Takashi Kuriyama 1997-01-07
5574352 Frequency control method for inverter and apparatus therefor Tsunehiro Endo, Tsuyoshi Sasaki, Hiroshi Fujii 1996-11-12
5445682 Method of applying surface hydrophilic treatment to heat-transfer tube Naoyuki Hasegawa, Hisanori Shiraishi 1995-08-29
5300872 Method and apparatus for control of inverter Tsunehiro Endo, Shizuo Takahashi, Masaya Taniguchi, Hiroshi Maruyama 1994-04-05
5095878 Air/fuel ratio control system for internal combustion engine Shiro Kumagai, Katsuo Akishino, Reijiro Komagome, Michiyasu Yoshida, Tateo Kume +2 more 1992-03-17
5077971 Air/fuel ratio control system for an internal combustion engine Shiro Kumagai, Katsuo Akishino, Reijiro Komagome, Michiyasu Yoshida, Tateo Kume +2 more 1992-01-07
5000843 Culture fluid concentrator Eitaro Kumazawa, Takao Hatai, Atushi Baba, Masahiko Takahashi 1991-03-19