Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8111594 | Optical disk drive and optical pickup having aberration correction means | Masayuki Iwasaki, Naoki Fujii | 2012-02-07 |
| RE40556 | Multi-layer information recording medium and information recording and reproducing apparatus | Takanori Maeda | 2008-10-28 |
| 7190664 | High density optical recording medium and method for reproducing thereof | Takuma Yanagisawa, Takayuki Nomoto, Yasumitsu Wada, Fumihiko Yokogawa | 2007-03-13 |
| RE39463 | Multi-layer information recording medium and information recording and reproducing apparatus | Takanori Maeda | 2007-01-09 |
| RE39322 | Multi-layer information recording medium and information recording and reproducing apparatus | Takanori Maeda | 2006-10-03 |
| 6773781 | Multi-layer information recording medium and information recording and reproducing apparatus | Takanori Maeda | 2004-08-10 |
| 6418104 | Tilt detector | Makoto Sato | 2002-07-09 |
| 5615206 | Optical disk | Takuma Yanagisawa, Hiroki Kuribayashi | 1997-03-25 |
| 5608715 | Multi-layered recording disk and recording/reproducing system using the same | Fumihiko Yokogawa | 1997-03-04 |
| 5546372 | Information detection light intensity control apparatus in optical disc recorded-information reproducing apparatus | Takuma Yanagisawa | 1996-08-13 |
| 5455817 | Second harmonics generating optical recording layer | Takuma Yanagisawa | 1995-10-03 |
| 5381391 | Optical recording medium having a third non-linear optical reflection film | Takuma Yanagisawa | 1995-01-10 |
| 5365052 | Optical information reading apparatus with controlled numerical aperture relationship between focusing and receiving optical systems | Takuma Yanagisawa | 1994-11-15 |
| 5258968 | Tracking error signal generating device for preventing offset of the generated tracking error signal | Norio Matsuda | 1993-11-02 |
| 4919511 | Fibre-type light conversion device | — | 1990-04-24 |
| 4874221 | Fibre-type light wavelength conversion device | — | 1989-10-17 |
| 4852480 | Dot line printer with individually replaceable printing head | Masao Kunita, Michio Koizumi | 1989-08-01 |
| 4774882 | Method for controlling printing impact power in impact type dot printer | Masahiko Kaneko, Takashi Yokoyama | 1988-10-04 |
| 4757760 | Wire mask for a dot printer head apparatus | Shohachi Nihara, Michio Koizumi, Masao Kunita | 1988-07-19 |
| 4650348 | Method of dot-printing underlines | Masahiko Kaneko, Masao Kunita | 1987-03-17 |
| 4527921 | Paper feed apparatus for shuttle printer | Michio Koizumi, Yasuo Iwata | 1985-07-09 |