Target Technologies has filed a patent suit against Sony stating that its Blu-ray technologies infringe on a Target Technologies patent covering Sony’s use of a less corrosive and less costly Silver based alloy layer for its Blu-ray discs.

Target Technologies has a series of related patents dating back to filings in June 1998 covering the use of metal alloys for the reflective layer of an optical storage disc. Did Sony know about Target Technologies patents?

Sony has almost 400 issued patents on optical disc technologies. While CNet reports that Sony has not commented on the case, Sony does have a its patents, which can be considered grounds for willful infringement.

Target’s filing does not state whether its patents cover all Blu-ray discs made to date or just a portion of them.

Sony sued over Blu-ray [CNet]