Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7375820 | Interference measuring apparatus for detecting a plurality of stable phase difference signals | Ko Ishizuka, Hidejiro Kadowaki, Yasushi Kaneda, Shigeki Kato, Sakae Horyu | 2008-05-20 |
| 7034947 | Compact interference measuring apparatus for detecting the magnitude and direction of positional deviation | Ko Ishizuka, Hidejiro Kadowaki, Yasushi Kaneda, Shigeki Kato, Sakae Horyu | 2006-04-25 |
| 6674066 | Encoder | Yasushi Kaneda, Hidejiro Kadowaki, Ko Ishizuka, Shigeki Kato, Sakae Horyu | 2004-01-06 |
| 6657181 | Optical element used in compact interference measuring apparatus detecting plurality of phase difference signals | Ko Ishizuka, Hidejiro Kadowaki, Yasushi Kaneda, Shigeki Kato, Sakae Horyu | 2003-12-02 |
| 6618218 | Displacement detecting apparatus and information recording apparatus | Hidejiro Kadowaki, Ko Ishizuka, Yasushi Kaneda, Shigeki Kato, Sakae Horyu | 2003-09-09 |
| 6570660 | Measuring instrument | Ko Ishizuka | 2003-05-27 |
| 6473184 | Interferometer which divides light beams into a plurality of beams with different optical paths | Ko Ishizuka, Hidejiro Kadowaki, Yasushi Kaneda, Shigeki Kato, Sakae Horyu | 2002-10-29 |
| 5956140 | Displacement detection apparatus and drive control apparatus using the same constructed to prevent collision between gratings | Kou Ishizuka | 1999-09-21 |