Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8503098 | Zoom lens for projection and projection-type display apparatus | — | 2013-08-06 |
| 8228613 | Wide-angle projection zoom lens and projection type display apparatus | — | 2012-07-24 |
| 8213091 | Wide-angle projection zoom lens and projection display device | — | 2012-07-03 |
| 7885009 | Small projection lens and projection display device using the same | Tomoyuki Baba, Chikara Yamamoto | 2011-02-08 |
| 6457829 | Projection device comprising a correction lens arranged between a prism optical system and at least one of three optical modulation elements | Kimiaki Nakazawa | 2002-10-01 |
| 5367405 | Projecting lens | — | 1994-11-22 |
| 4560254 | Zoom lens system | Yoshikazu Doi | 1985-12-24 |
| 4245891 | Zoom lens system with a movable distortion-correcting element | Yoshikazu Doi | 1981-01-20 |