Issued Patents All Time
Showing 25 most recent of 48 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7554671 | Absolute position measurement apparatus | Ko Ishizuka, Shigeki Kato | 2009-06-30 |
| 7551290 | Absolute position measurement apparatus | Ko Ishizuka, Shigeki Kato | 2009-06-23 |
| 7375820 | Interference measuring apparatus for detecting a plurality of stable phase difference signals | Ko Ishizuka, Yasushi Kaneda, Shigeki Kato, Takayuki Kadoshima, Sakae Horyu | 2008-05-20 |
| 7110120 | Movement-direction determination apparatus | Kato Shigeki | 2006-09-19 |
| 7034947 | Compact interference measuring apparatus for detecting the magnitude and direction of positional deviation | Ko Ishizuka, Yasushi Kaneda, Shigeki Kato, Takayuki Kadoshima, Sakae Horyu | 2006-04-25 |
| 6674066 | Encoder | Yasushi Kaneda, Ko Ishizuka, Shigeki Kato, Takayuki Kadoshima, Sakae Horyu | 2004-01-06 |
| 6657181 | Optical element used in compact interference measuring apparatus detecting plurality of phase difference signals | Ko Ishizuka, Yasushi Kaneda, Shigeki Kato, Takayuki Kadoshima, Sakae Horyu | 2003-12-02 |
| 6631047 | Interference device, position detecting device, positioning device and information recording apparatus using the same | Kou Ishizuka, Naoki Kawamata, Hiroyuki Hagiwara, Makoto Takamiya, Shigeki Kato +1 more | 2003-10-07 |
| 6618218 | Displacement detecting apparatus and information recording apparatus | Ko Ishizuka, Yasushi Kaneda, Shigeki Kato, Takayuki Kadoshima, Sakae Horyu | 2003-09-09 |
| 6473184 | Interferometer which divides light beams into a plurality of beams with different optical paths | Ko Ishizuka, Yasushi Kaneda, Shigeki Kato, Takayuki Kadoshima, Sakae Horyu | 2002-10-29 |
| 6259531 | Displacement information measuring apparatus with hyperbolic diffraction grating | Makoto Takamiya, Kou Ishizuka, Yasushi Kaneda | 2001-07-10 |
| 6151185 | Position detecting apparatus, positioning apparatus, and information recording apparatus using the same | Kou Ishizuka, Makoto Takamiya | 2000-11-21 |
| 5930066 | Information recording apparatus | Kou Ishizuka, Naoki Kawamata, Hiroyuki Hagiwara, Jun Ashiwa | 1999-07-27 |
| 5828387 | Recording apparatus with compensation for variations in feeding speed | Masafumi Wataya, Toshiyuki Yanaka, Ken Tsuchii, Haruhiko Takahashi, Makoto Takamiya +1 more | 1998-10-27 |
| 5812250 | Doppler velocimeter and various kinds of apparatuses for signal processing thereof | Yasuhiko Ishida, Makoto Takamiya, Jun Ashiwa, Shigeki Kato, Shinji Ueda | 1998-09-22 |
| 5796470 | Frequency shifter and optical displacement measuring apparatus using the frequency shifter | Shinji Ueda, Makoto Takamiya, Shigeki Kato | 1998-08-18 |
| 5774218 | Laser Doppler velocimeter with electro-optical crystal | Makoto Takamiya | 1998-06-30 |
| 5737116 | Frequency shifter and optical displacement measuring apparatus using the same | Makoto Takamiya, Shigeki Kato | 1998-04-07 |
| 5712929 | Image processing apparatus | Naoto Kawamura | 1998-01-27 |
| 5696578 | Frequency tracking method and apparatus, and Doppler velocity meter using the same | Yasuhiko Ishida, Makoto Takamiya, Jun Ashiwa, Shigeki Kato, Shinji Ueda | 1997-12-09 |
| 5666444 | Image processing apparatus | Naoto Kawamura | 1997-09-09 |
| 5640239 | Optical device and displacement information measurement apparatus using the same | Makoto Takamiya | 1997-06-17 |
| 5629793 | Frequency shifter and optical displacement measurement apparatus using the same | Makoto Takamiya | 1997-05-13 |
| 5589858 | Information recording apparatus | Hiroshi Sugiyama, Yasuhiko Ishida, Makoto Takamiya | 1996-12-31 |
| 5557407 | Measuring apparatus having a diffraction grating for receiving a diverged light beam | Makoto Takamiya | 1996-09-17 |