Issued Patents All Time
Showing 76–100 of 135 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5216677 | Data reproducing apparatus | Yuji Takagi, Yoshihisa Fukushima, Katsumi Murai | 1993-06-01 |
| 5214635 | Erasable optical disk and optical information recording/reproduction apparatus | Makoto Ichinose, Yoshihisa Fukushima, Yuzuru Kuroki | 1993-05-25 |
| 5202876 | Optical disc recording-reproducing apparatus in which sector substitution of defective sectors is performed | Yuji Takagi, Yoshihisa Fukushima, Yasushi Azumatani, Hiroshi Hamasaka | 1993-04-13 |
| 5184341 | Information recording method having successive data write and data verify operations | Hiroshi Hamasaka, Yoshihisa Fukushima | 1993-02-02 |
| 5173886 | Composite optical disc having both a data read-only area and a data rewritable area, and a recording/reproducing system for use therewith | Yoshihisa Fukushima, Makoto Ichinose, Yuzuru Kuroki, Yuji Takagi | 1992-12-22 |
| 5161143 | Information recording-reproducing apparatus for optimizing data transfer | Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani, Hiroshi Hamasaka | 1992-11-03 |
| 5153866 | Optical disc recording-reproducing apparatus for determining the last recorded sensor | Noboru Yamada | 1992-10-06 |
| 5153885 | Bit error measuring apparatus | Yasushi Azumatani, Yoshihisa Fukushima, Yuji Takagi, Hiroshi Hamasaka | 1992-10-06 |
| 5148421 | Optical head | Sadao Mizuno, Noboru Itoh | 1992-09-15 |
| 5138599 | Information recording medium having dummy tracks and information recording and reproducing apparatus | Yoshihisa Fukushima, Yasushi Azumatani | 1992-08-11 |
| 5119363 | Optical disk having an index mark | Tomio Yoshida, Shunji Ohara, Kenji Koishi | 1992-06-02 |
| 5111444 | Method of managing defective sectors in a disk-shaped information recording medium and an apparatus for performing the same | Yoshihisa Fukushima | 1992-05-05 |
| 5077720 | Optical information recording and reproducing system and optical disk | Yuji Takagi, Makoto Ichinose, Yoshihisa Fukushima, Yuzuru Kuroki, Yasushi Azumatani | 1991-12-31 |
| 5073887 | Optical disk recording and reading system with directory data access mechanism | Yuji Takagi, Makoto Ichinose, Yoshihisa Fukushima, Yuzuru Kuroki | 1991-12-17 |
| 5054017 | Optical information reproducing apparatus | Jun Hiroyoshi, Yuzuru Kuroki | 1991-10-01 |
| 5051998 | Data block deinterleaving and error correction system | Katsumi Murai, Yuzuru Kuroki | 1991-09-24 |
| 5023854 | Disc having a data read-only area and a data recording arm and a recording reproducing system therefor | Yoshihisa Fukushima, Makoto Ichinose, Yuzuru Kuroki, Yuji Takagi | 1991-06-11 |
| 4986668 | Information recording and reproducing apparatus with management of defective sector | Yoshihisa Fukushima, Makoto Ichinose, Yuzuru Kuroki, Yuuji Takagi | 1991-01-22 |
| 4984230 | Rewritable optical disk with defective-sector substitution arrangement and optical information recording and reproducing system | Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani | 1991-01-08 |
| 4969139 | Optical information recording and reproducing apparatus having an improved detection system for detecting fouling of a disk or an internal optical system | Yasushi Azumatani, Makoto Ichinose, Yoshihisa Fukushima, Yuzuru Kuroki, Yuji Takagi | 1990-11-06 |
| 4964094 | Optical disk | Makoto Ichinose, Yoshihisa Fukushima, Yuzuru Kuroki, Yuji Takagi, Yasushi Azumatani | 1990-10-16 |
| 4949326 | Optical information recording and reproducing system using optical disks having an error correction function | Yuji Takagi, Makoto Ichinose, Yoshihisa Fukushima, Yuzuru Kuroki, Yasushi Azumatani | 1990-08-14 |
| 4939713 | Erasable optical disk and optical information recording/reproduction apparatus | Makoto Ichinose, Yoshihisa Fukushima, Yuzuru Kuroki | 1990-07-03 |
| 4885735 | Information recording and reproducing apparatus with management of defective sector | Yoshihisa Fukushima, Makoto Ichinose, Yuzuru Kuroki, Yuuji Takagi | 1989-12-05 |
| 4879704 | Optical disk, optical disk recording and reproducing apparatus and copy preventive method for optical disks | Yuuji Takagi, Makoto Ichinose, Yoshihisa Fukushima, Yuzuru Kuroki | 1989-11-07 |