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Your search returned 621 patents.
( 369/283 in Current US Classification ) |
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| Patent ID | Title | Date Filed |
| 6563782 | INFORMATION RECORDING MEDIUM HAVING DOUBLE-LAYER STRUCTURE, AND INFORMATION REPRODUCING APPARATUS AND INFORMATION RECORDING AND REPRODUCING APPARATUS UTILIZING INFORMATION RECORDING MEDIUM HAVING DOUBLE-LAYER STRUCTURE
| April 19, 2001 |
| 6538978 | Multi-layer optical record carrier not requiring spherical aberration correction
| May 21, 1997 |
| 6538961 | Apparatus and method for recording an optical disc identification code
| May 29, 2002 |
| 6534142 | Label for non-circular optical discs
| October 13, 2000 |
| 6531262 | Methods and apparatus for rendering an optically encoded medium unreadable and tamper-resistant
| October 17, 2000 |
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