Issued Patents All Time
Showing 51–75 of 135 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5831471 | DC-stabilized power circuit | Akio Nakajima | 1998-11-03 |
| 5764620 | Multi-layered optical disk with shifted track and layer identification and method of detecting a track | Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani, Hiroshi Hamasaka | 1998-06-09 |
| 5648954 | Optical disk using land and groove tracks | — | 1997-07-15 |
| 5566350 | Information device for providing fast data transfer with minimum overhead | Yuji Takagi, Yoshihisa Fukushima, Yasushi Azumatani, Hiroshi Hamasaka | 1996-10-15 |
| 5541900 | Optical information recording and reproducing apparatus and method for different spot size type media | Motoshi Ito | 1996-07-30 |
| 5517484 | Optical disk and optical disk recording and reproducing apparatus | Yuji Takagi, Motoshi Ito, Yuji Hisakado | 1996-05-14 |
| 5513160 | Optical disc and contamination detection system in an apparatus for recording and reproducing the same | Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani | 1996-04-30 |
| 5485439 | Method for recording/reproducing information and apparatus therefor | Hiroshi Hamasaka, Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani | 1996-01-16 |
| 5475668 | Method of producing file management structures, information reproduction apparatus and information reproducing method | Yasushi Azumatani, Yoshihisa Fukushima, Yuji Takagi, Hiroshi Hamasaka | 1995-12-12 |
| 5469418 | Optical information write/read device and method for writing data | Yuji Takagi, Yuji Hisakado | 1995-11-21 |
| 5457153 | Liquid coating composition | Yoshio Hagiwara, Hatsuyuki Tanaka, Toshimasa Nakayama | 1995-10-10 |
| 5457794 | Information retrieval apparatus for searching target literature data from an information recording medium, including reuse of past retrieving results | Yasushi Azumatani, Yoshihisa Fukushima, Yuji Takagi, Hiroshi Hamasaka, Yuji Hisakado | 1995-10-10 |
| 5428597 | Multi-layered optical disk with track and layer identification | Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani, Hiroshi Hamasaka | 1995-06-27 |
| 5406534 | Double-sided recordable optical disk suitable for a substituting process and a method for performing defect management | Yuji Hisakado, Yuji Takagi, Motoshi Ito | 1995-04-11 |
| 5388105 | Method of recording/reproducing optical disk data | Yuji Takagi, Yuzuru Kuroki | 1995-02-07 |
| 5359584 | Data recording/reproducing method and apparatus having means for reliable detection of unrecorded sectors | Yoshihisa Fukushima, Yuzuru Kuroki, Tamotsu Matsuo | 1994-10-25 |
| 5313612 | Information recording and reproducing apparatus including both data and work optical disk drives for restoring data and commands after a malfunction | Yoshihisa Fukushima | 1994-05-17 |
| 5303225 | Multi-layered optical disk with track and layer identification | Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani, Hiroshi Hamasaka | 1994-04-12 |
| 5293566 | Information recording and reproducing apparatus | Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani, Hiroshi Hamasaka | 1994-03-08 |
| 5270877 | Information recording medium and information recording and reproducing apparatus | Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani, Hiroshi Hamasaka | 1993-12-14 |
| 5255260 | Optical recording apparatus employing stacked recording media with spiral grooves and floating optical heads | Noboru Yamada, Sadao Mizuno, Yasuhiro Gotoh | 1993-10-19 |
| 5253242 | Double-sided optical disc player | Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani, Hiroshi Hamasaka | 1993-10-12 |
| 5243581 | Data recording/reproducing apparatus having plural optical disk drives operating in parallel | Takagi Yuji, Yoshihisa Fukushima, Yasushi Azumatani, Hiroshi Hamasaka | 1993-09-07 |
| 5237553 | Data recording and reproducing apparatus having a plurality of operating modes | Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani, Hiroshi Hamasaka | 1993-08-17 |
| 5231617 | Optical information recording and reproducing apparatus and method of recording and reproducing information in an optical disk unit | Sadao Mizuno, Noboru Yamada, Yasuhiro Gotoh | 1993-07-27 |