These documents were retrieved from
http://www.patents.ibm.com.
They are also available at
http://www.patentminer.com.
Patent 5,437,464 -- "Data Reading and Image System for CD-ROM"(really a patent for the Sega CD itself) | ||
| Text Pages | Diagram Pages | |
Patent 5,371,792 -- "CD-ROM Disk and Security Check Method for the Same"(really a patent for the Sega CD country/region lockout hardware/software) | ||
| Text Pages | Diagram Pages | |
