The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 2002
Filed:
Aug. 15, 2000
François Le Carvennec, Senlisse, FR;
Thomson-CSF, Paris, FR;
Abstract
A pirate-proof optical recording disc and a process for reading such a disc. The disc includes a spiral main track and a secondary track span interposed between two successive turns of the main track. An initialization zone includes a datum regarding the nature of the pirate-proof disc and a datum for relative positioning of the span, to which the reader goes by travelling to an address of the main track and by effecting a track jump. The span is identified by an identification datum which it carriers and a check is then made as to whether the physical structure of the disc complies with that described in the initialization zone. The process applies to the pirate-proofing of any optical disc, especially of CD or DVD format.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile