Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5051569 | Method for recording data onto optical data recording cards including data regions and sync regions | Yoshiaki Tsuruoka, Yorihiko Sakai | 1991-09-24 |
| 5041356 | Process for preparing optical recording material | Mitsuru Takeda | 1991-08-20 |
| 5008552 | Data recording and reproducing apparatus for an optical card | Yoshiaki Tsuruoka, Norikazu Saitou, Akira Shibuya, Shuichi Yamashita | 1991-04-16 |
| 4970712 | Method for recording data onto optical data recording cards using pits for indicating the center line positions of data arrays provided on said cards | Yoshiaki Tsuruoka, Yorihiko Sakai | 1990-11-13 |
| 4816362 | Optical recording cards with non-recording reflective layer | Mitsuru Takeda | 1989-03-28 |
| 4754128 | Optical cards and processes for preparing the same | Mitsuru Takeda | 1988-06-28 |
| 4673626 | Optical recording card with optical recording layers | Mitsuru Takeda | 1987-06-16 |