Issued Patents All Time
Showing 1–25 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7586683 | Zoom lens, still image camera comprising the zoom lens, and video camera comprising the zoom lens | Katsu Yamada | 2009-09-08 |
| 7336419 | Zoom lens, still image camera comprising the zoom lens, and video camera comprising the zoom lens | Katsu Yamada | 2008-02-26 |
| 7046350 | Device for calculating diffraction efficiencies of a diffraction lens, lens with grating element, and optical system for reading | Michihiro Yamagata, Kazutake Boku, Yasuhiro Tanaka, Tomohiko Sasano | 2006-05-16 |
| 6542312 | Zoom lens and video camera using the same | Hiroaki Okayama | 2003-04-01 |
| 6441968 | Zoom lens and video camera and electronic still camera using this | Hiroaki Okayama, Masaki Hirokoh | 2002-08-27 |
| 6349000 | Device for calculating diffraction efficiencies of a diffraction lens, lens with grating element, and optical system for reading | Michihiro Yamagata, Kazutake Boku, Yasuhiro Tanaka, Tomohiko Sasano | 2002-02-19 |
| 6055105 | Optical system with grating element and imaging device using the same | Kazutake Boku | 2000-04-25 |
| 5978152 | Zoom lens system | Hiroaki Okayama, Hisayuki II, Tsuyoshi Kakimoto | 1999-11-02 |
| 5940221 | Zoom lens and video camera comprising the same | Hiroaki Okayama, Hisayuki II | 1999-08-17 |
| 5814806 | Code sheet representing multiple code information and method for producing the same | Yasuhiro Tanaka, Hiroaki Okayama, Kazutake Boku, Michihiro Yamagata, Katsu Yamada +2 more | 1998-09-29 |
| 5583698 | Aspherical zoom lens | Katsu Yamada, Tsuyoshi Kakimoto | 1996-12-10 |
| 5555132 | Wide-conversion lens and a zoom lens with it | Katsu Yamada | 1996-09-10 |
| 5552937 | Wide-angel aspheric zoom lens | Hiroaki Okayama, Yasuo Nakajima | 1996-09-03 |
| 5504621 | Two-dimensional optical low-pass filter | Hiroaki Okayama | 1996-04-02 |
| 5434709 | Wavelength-selective phase grating type optical low-pass filter comprising adhesive layer between transparent layers | Katsu Yamada, Hiroaki Okayama | 1995-07-18 |
| 5396367 | Zoom lens assembly | Hisayuki II, Hiroaki Okayama, Yasuo Nakajima | 1995-03-07 |
| 5375013 | Optical low pass filter | Hiroaki Okayama | 1994-12-20 |
| 5267082 | Zoom lens | Hiroaki Okayama | 1993-11-30 |
| 5237452 | Wavelength-selective phase-grating optical low-pass filter | Hiroaki Okayama | 1993-08-17 |
| 5235466 | Zoom lens | Hisayuki II | 1993-08-10 |
| 5100223 | Zoom lens | Keizo Ishiguro, Yasuo Nakajima, Hisayuki II, Rieko Hiramoto | 1992-03-31 |
| 4991944 | Zoom lens driving apparatus | Yoshiaki Hirao, Ryuichiro Kuga, Masayuki Yoneyama | 1991-02-12 |
| 4924317 | Video camera with an automatic focusing system | Yoshiaki Hirao, Ryuichiro Kuga, Masayuki Yoneyama | 1990-05-08 |
| 4850692 | Semiconductor light position detector for rangefinder | Yoshiaki Hirao, Ryuichiro Kuga, Hiroyuki Asakura, Yoshitomi Nagaoka, Shinji Hataji +1 more | 1989-07-25 |
| 4767199 | Projection lens | Yoshiharu Yamamoto, Yasuo Nakajima | 1988-08-30 |