Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6738331 | Copy-protected optical disk and protection process for such disk | Francois-Xavier Pirot, Jean-Louis Duhamel, Marc Des Rieux | 2004-05-18 |
| 6452886 | Antihacking optical recording disc and method for reading same | — | 2002-09-17 |
| 6091697 | Optical recording medium having a plurality of recording layers | Jean-Pierre Huignard, Claude Puech | 2000-07-18 |
| 5864526 | Optical focussing adjustment device | — | 1999-01-26 |
| 5680386 | Optical method and system for writing/reading information on a recording medium | Jean-Pierre Huignard, Claude Puech, Brigitte Loiseaux | 1997-10-21 |
| 5475672 | Variable-length information recording with reference marks for time reference during information reading | — | 1995-12-12 |
| 4868804 | Optical memory system which uses a different illumination mode when scanning reserved areas | Daniel Lecomte, Dominique Leterme, Rene Romeas | 1989-09-19 |
| 4551733 | Protected optical disc comprising a flexible closure element | Jean Cornet, Francois Lange, Jean-Claude Lehureau, Roger Rascle | 1985-11-05 |
| 4387452 | Optical device for the recording and reading of data media and optical memory system incorporating such a device | Claude Bricot, Pierre J. Lepetit | 1983-06-07 |
| 4253115 | Process for the transmission of an audiofrequency analog signal during line-frame synchronization intervals of a television signal and apparatus for performing this process | Jean-Marc Kergosien | 1981-02-24 |