HK

Hiroshi Katayama

Brother Kogyo: 38 patents #186 of 2,767Top 7%
HI Hitachi: 28 patents #1,022 of 28,497Top 4%
SO Sony: 18 patents #2,315 of 25,231Top 10%
SC Shikoku Kakoki Co.: 10 patents #10 of 103Top 10%
Fujitsu Limited: 8 patents #3,989 of 24,456Top 20%
Sharp Kabushiki Kaisha: 7 patents #2,322 of 10,731Top 25%
Sumitomo Electric Industries: 6 patents #4,612 of 21,551Top 25%
SE Seiko Epson: 4 patents #3,385 of 7,774Top 45%
DP Daicel Polymer: 3 patents #2 of 31Top 7%
PA Panasonic: 3 patents #7,617 of 21,108Top 40%
Ricoh Company: 2 patents #5,693 of 9,818Top 60%
YE Yaskawa Electric: 1 patents #557 of 1,006Top 60%
KT Kabushiki Kaisha Toshiba: 1 patents #13,537 of 21,451Top 65%
JC Japan Servo Co.: 1 patents #92 of 161Top 60%
HC Hitachi Automotive Engineering Co.: 1 patents #156 of 314Top 50%
DE Denso: 1 patents #6,940 of 11,792Top 60%
NE Nec: 1 patents #7,889 of 14,502Top 55%
Overall (All Time): #7,993 of 4,157,543Top 1%
133
Patents All Time

Issued Patents All Time

Showing 126–133 of 133 patents

Patent #TitleCo-InventorsDate
5194919 Optical type position detecting device 1993-03-16
5175479 Moving body position control apparatus and signal reproducing apparatus Fumio Tajima, Taizou Miyazaki, Shigeki Morinaga, Nobuyoshi Mutoh, Seiichi Narushima 1992-12-29
5093821 Optical pickup apparatus using plural laser sources of different wavelengths Michiaki Sato 1992-03-03
5023924 Speed control apparatus for movable equipment Fumio Tajima, Kunio Miyashita, Shigeki Morinaga, Seiichi Narushima 1991-06-11
4980617 Speed control apparatus of movable equipment Fumio Tajima, Tunehiro Endo, Kunio Miyashita, Seiichi Narushima, Jun Ohya +1 more 1990-12-25
4918346 Low ripple-torque permanent magnet brushless motor Fumio Tajima, Nicolas Samman, Kunio Miyashita, Motoya Ito, Seiichi Narushima +1 more 1990-04-17
4914361 Method and apparatus for controlling the speed of moving body Fumio Tajima, Kunio Miyashita, Seiichi Narushima, Kouichi Saito 1990-04-03
4672253 Permanent magnet electrical machine with reduced cogging Fumio Tajima, Kunio Miyashita, Teizo Tamura, Kenichi Hironaka, Takuro Kawano +3 more 1987-06-09