In the latest twist of a long, ongoing legal dispute, Infineon has filed a motion to dismiss a patent infringement suit brought against it by Rambus.

The motion was filed last week but it was not made public until this week when it appeared on the Rambus website [pdf].

Rambus has been embroiled in a series of lawsuits with three of the world's leading chip makers, including Infineon, Micron and Hynix, as it seeks to collect royalty payments. Rambus claims that the rival producers of DRAM chips have infringed on its patents. Collectively, the royalties could be worth billions of dollars.

Infineon filed a motion for the judge to dismiss Rambus' patent suit claiming alleged document destruction and false testimony.

From the start of the litigation, which has been going on for several years, Rambus has accused Hynix, Infineon and Micron of using its patents, while the memory chip makers contend that Rambus didn't mention holding any patents at meetings held by the standards-setting body, JEDEC.