Issued Patents All Time
Showing 26–39 of 39 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4998798 | Encoder having long length measuring stroke | Koh Ishizuka, Satoshi Ishii, Yoichi Kubota, Masaaki Tsukiji | 1991-03-12 |
| 4979826 | Displacement measuring apparatus | Koh Ishizuka, Masaaki Tsukiji, Satoshi Ishii, Yoichi Kubota | 1990-12-25 |
| 4975570 | Rotary encoder using multiple diffracted beams having co-incident paths | Koh Ishizuka, Masaaki Tsukiji, Satoshi Ishii, Yoichi Kubota | 1990-12-04 |
| 4970388 | Encoder with diffraction grating and multiply diffracted light | Satoshi Ishii, Yoichi Kubota, Koh Ishizuka, Masaaki Tsukiji | 1990-11-13 |
| 4967072 | Interferometric rotating condition detection apparatus | — | 1990-10-30 |
| 4933673 | Encoder | Koh Ishizuka, Masaaki Tsukiji, Satoshi Ishii | 1990-06-12 |
| 4930895 | Encoder for forming interference fringes by re-diffracted lights from an optical type scale and photoelectrically converting the interference fringes to thereby detect the displacement of the scale | Masaaki Tsukiji, Satoshi Ishii, Koh Ishizuka | 1990-06-05 |
| 4912320 | Optical type encoder including diffraction grating for producing interference fringes that are processed to measure displacement | Satoshi Ishii, Koh Ishizuka, Masaaki Tsukiji | 1990-03-27 |
| 4868385 | Rotating state detection apparatus using a plurality of light beams | — | 1989-09-19 |
| 4829342 | Moving state detection apparatus | — | 1989-05-09 |
| 4682237 | Photographic optical apparatus | Masatake Kato, Hideo Yokota | 1987-07-21 |
| 4677489 | Image pickup apparatus | Hideo Yokota, Masatake Kato | 1987-06-30 |
| 4609272 | Finder system of high image magnification | Hideo Yokota, Masatake Kato | 1986-09-02 |
| 4592636 | View finder optical system | Masatake Kato, Hideo Yokota | 1986-06-03 |